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8 April, 00:32

It took boat to travel from pier A to pier B 5 hours going upstream. It made the return trip downstream in 3 hours and 30 minutes. What is the distance between two piers, if the speed of the current is 3 mph?

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Answers (2)
  1. 8 April, 00:52
    0
    9.5 miles, I think. (If not, I'm sorry!)
  2. 8 April, 00:54
    0
    Distance = speed * time

    Upstream

    d = 5 * (x - 3)

    Downstream

    d = 3.5 (x + 3) where d = distance beween piers and x = speed of the boat

    Equating:-

    5x - 15 = 3.5x + 10.5

    1.5x = 25.5

    so x = 17 mph

    so d = 5 (17) - 15 = 85-15 = 70 miles Answer
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