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12 December, 23:49

Two boats start together and race across a 50-km-wide lake and back. Boat A goes across at 50 km/h and returns at 50 km/h. Boat B goes across at 25 km/h, and its crew, realizing how far behind it is getting, returns at 75 km/h. Turnaround times are negligible, and the boat that completes the round-trip first wins.

Required:

a. Which boat wins?

b. What is the average velocity of the winning boat?

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Answers (1)
  1. 13 December, 03:00
    0
    Boat A wins and 50km/hr

    Explanation:

    To solve this problem we need to calculate the time required for both boats to make the round trip.

    For Boat A.

    The time required for the first trip = distance / speed = 50/50 = 1h

    For the return trip the time is same since it's the same distance on the same speed.

    Hence the time taken for boat A to make the round trip is 2hrs.

    For boat B,

    The time required for the first trip = distance / speed = 50/25 = 2h

    The time for the return trip is;

    =distance / speed = 50/75 = 2/3h = 2/3*60 = 40mins

    By comparing both time.

    Boat A requires less time hence Boat A wins.

    2. The average velocity of the winning boat is the velocity of boat A.

    Which is total distance / total time for the trip.

    100km/2hrs = 50km/hr
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