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+#  The following is a template of the design.
+#  you will need to complete the definition of each class, including class attributes,
+# instance attributes, and instance methods. However, please do not change the class
+# names provided below.
+
+# IMPORTANT: In order to get your program pass the test, make sure your class constructors
+# use exactly the same parameter names as in the test examples provided at the end of this template.
+
+# ================Your codes start here=============
+# Notes:
+#   - Should a motorboat (or eboat) really *be* an engine?
+#   - Why are the keyword arguments abbreviated?
+
+
+def class_bases(cls):
+    """Generator of the base classes of a class (including the given class).
+
+    Depth-first, post-order, may yield duplicates
+    """
+    for cls_ in cls.__bases__:
+        yield from class_bases(cls_)
+    yield cls
+
+
+def field_repr(obj) -> str:
+    """String representation of an object
+
+    Lists fields with type annotations in object's class and superclasses"""
+    classes = class_bases(obj.__class__)
+    attrs = (
+        attr for cls in classes for attr in getattr(cls, "__annotations__", {}).keys()
+    )
+    attrs_vals = ",".join(f"{attr}={getattr(obj, attr, None)!r}" for attr in attrs)
+    return f"{obj.__class__.__name__}({attrs_vals})"
+
+
+class Boat:
+    """A boat
+
+    Attributes:
+      - `color`: color of boat
+      - `brand`: boat brand
+      - `year`: manufacture year
+
+    Class Attributes:
+      - `all_boats`: a list of all boats ever constructed
+    """
+
+    all_boats = []
+
+    color: str
+    brand: str
+    year: int
+
+    def __init__(
+        self,
+        *,
+        co: str,
+        br: str,
+        yr: int,
+        **kwargs,
+    ):
+        """Initialize a `Boat`.
+
+        Takes keyword-only arguments `co` (color), `br` (brand), and `yr` (year)
+          as described in class docstring
+        """
+        Boat.all_boats.append(self)
+        super().__init__(**kwargs)
+
+        self.color = co
+        self.brand = br
+        self.year = yr
+
+    def __str__(self):
+        return field_repr(self)
+
+    def get_boat_age(self, current_year: int) -> int:
+        """Get the age of this boat given the current year"""
+        return current_year - self.year
+
+
+class Engine:
+    """An Engine
+
+    Attributes:
+      - `tech`: Technology used by the engine.
+        Either 'gas' or 'electric'
+      - `engine_speed`: maximum speed in miles per hour
+        determined by `tech` - gas engines have speed 80mph, electric 20mph
+
+    Class Attributes:
+      - `speeds`: mapping of engine tech to speed
+    """
+
+    speeds = {"gas": 80, "electric": 20}
+
+    engine_speed: float
+    tech: str
+
+    def __init__(self, *, tech: str, **kwargs):
+        """Initialize an `Engine`
+
+        Takes keyword-only argument `tech` (see class docstring)
+        """
+        super().__init__(**kwargs)
+
+        self.tech = tech
+        self.engine_speed = Engine.speeds[tech]
+
+    def __str__(self):
+        return field_repr(self)
+
+    def get_engine_speed(self) -> float:
+        """Get the engine speed for this engine in miles per hour"""
+        return self.engine_speed
+
+
+class Motorboat(Boat, Engine):
+    """A Motorboat
+
+    Always uses 'gas' engine tech
+    Attributes:
+      - `fuel_level`: remaining level of fuel in gallons
+      - `fuel_efficiency`: range with a certain amount of fuel in miles per gallon
+    """
+
+    fuel_level: float
+    fuel_efficiency: float
+
+    def __init__(self, *, fl: float, fe: float, **kwargs):
+        """Initialize a `Motorboat`
+
+        Takes keyword-only arguments `fl` (fuel level) and `fe` (fuel efficiency)
+          as described in class docstring, in addition to the arguments described in `Boat`
+        """
+        super().__init__(**kwargs, tech="gas")
+
+        self.fuel_level = fl
+        self.fuel_efficiency = fe
+
+    def get_max_speed(self) -> float:
+        """Get the max speed of the motorboat"""
+        return self.engine_speed
+
+    def cal_travel_time(self, distance: float) -> float:
+        """Calculate the time to travel `distance` miles
+
+        Prints a message and returns max engine runtime 
+         if the engine would run out of fuel before the destination
+        """
+        range = self.fuel_level * self.fuel_efficiency
+        if range < distance:
+            print(
+                f"This motorboat runs out of fuel {distance - range} miles away from the destination."
+            )
+        return min(range, distance) / self.engine_speed
+
+
+class Pedalboat(Boat):
+    """A Pedalboat
+
+    Attributes:
+      - `pedal_speed`: speed attainable by pedalling in miles per hour
+        Generally in range [10, 20]
+    """
+
+    pedal_speed: float
+
+    def __init__(self, *, ps: float, **kwargs):
+        """Initialize a `Pedalboat`
+
+        Clamps `pedal_speed` to `10 <= pedal_speed <= 20`
+
+        Takes keyword-only argument `ps` (pedal speed), as described in the class docstring,
+          in addition to the arguments described in `Boat`
+        """
+        super().__init__(**kwargs)
+
+        self.pedal_speed = ps
+        self.check_speed()
+
+    def get_pedal_speed(self) -> float:
+        """Get the pedalling speed of the boat in miles per hour"""
+        return self.pedal_speed
+
+    def cal_travel_time(self, distance: float) -> float:
+        """Calculate the time to travel `distance` miles
+        """
+        return distance / self.pedal_speed
+
+    def check_speed(self):
+        """Clamps `pedal_speed` to `10 <= pedal_speed <= 20`
+        Returns whether the speed was already in this range
+        """
+        if 10 <= self.pedal_speed <= 20:
+            return True
+        self.pedal_speed = min(20, max(self.pedal_speed, 10))
+        return False
+
+
+class Eboat(Pedalboat, Engine):
+    """An `Eboat`
+
+    Always has engine tech 'electric'
+    Attributes:
+      - `battery_time`: remaining battery running time in hours
+    """
+
+    battery_time: float
+
+    def __init__(self, *, bt: float, **kwargs):
+        """Initialize an `Eboat`
+
+        Takes keyword-only argument `bt` (battery time), as described in the class docstring,
+          in addition to the arguments described in `Pedalboat`
+        """
+        super().__init__(**kwargs, tech="electric")
+
+        self.battery_time = bt
+
+    def get_max_speed(self) -> float:
+        """The maximum speed attainable in this boat by running the engine and pedalling"""
+        return self.pedal_speed + self.engine_speed
+
+    def cal_travel_time(self, distance: float) -> float:
+        """Calculate the time to travel `distance` miles
+        """
+        battery_range = self.get_max_speed() * self.battery_time
+        return (
+            min(distance, battery_range) / self.get_max_speed()
+            + max(distance - battery_range, 0) / self.pedal_speed
+        )
+
+
+# ============ End of your codes here ==================
+
+
+# ============No modification beyond here =============
+# the following is a list of test instances, please do not modify them
+if __name__ == "__main__":
+    # arguments: co - color, br - brand, yr - year, tech - technology used in engine
+    boat1 = Boat(co="Black", br="Trek", yr=2012)
+    engine1 = Engine(tech="gas")
+    print(engine1.get_engine_speed())
+
+    # arguments: co - color, br - brand, yr - year, ps - pedal speed
+    pedalboat1 = Pedalboat(co="Red", br="GIANT", yr=2015, ps=15)
+    pedalboat2 = Pedalboat(co="Red", br="GIANT", yr=2015, ps=30)
+    print(pedalboat1.get_pedal_speed())
+    print(pedalboat2.get_pedal_speed())
+    print(pedalboat1.cal_travel_time(300))
+
+    # arguments: co - color, br - brand, yr - year, ps - pedal speed, bt - battery time
+    eboat1 = Eboat(co="Blue", br="Basis", yr=2018, ps=15, bt=10)
+    print(eboat1.get_max_speed())
+    print(eboat1.cal_travel_time(350))
+    print(eboat1.cal_travel_time(650))
+
+    # arguments: co - color, br - brand, yr - year, fl - fuel level, fe - fuel efficiency
+    motorboat1 = Motorboat(co="Silver", br="YAMAHA", yr=2013, fl=40, fe=12)
+    print(motorboat1.get_max_speed())
+    print(motorboat1.cal_travel_time(300))
+    print(motorboat1.cal_travel_time(600))
+
+    # get the age of all bikes created
+    for b in Boat.all_boats:
+        print(b.get_boat_age(2023))