An outboard motor boat can pull a water skier at a cruising speed of 28mi/h in still water?

Written by on June 22, 2009
cruising93 An outboard motor boat can pull a water skier at a cruising speed of 28mi/h in still water?
An outboard motor boat can pull a water skier at a cruising speed of 28mi/h in still water. the boat takes a skier for a ride in a river that flows at 6mi/h . the boat takes the skier upstream and then returns home. the trip takes one hour. how far upstream does it travel?

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One Response to “An outboard motor boat can pull a water skier at a cruising speed of 28mi/h in still water?”

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  1. Anonymous says:
    June 24, 2009 at 8:50 am

    In this case the skier is irrelevent. The formula will simply be the speed of the boat.
    22t – 34(1 – t) = 0 , shows speed up and down, and that time = 1
    22t – 34 + 34t = 0
    56t = 34
    t = .607 hr
    .607 * 22 = 13.36 miles, time upstream is .607 hr
    (1 – .607) = .393 hr
    .393 * 34 = 13.36 miles , time downstream is .393 hr

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