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17 March, 20:21

A boat traveled 280 miles downstream and back. The trip downstream took 7 hours. Trip back took 14 hours. What is the speed of the boat in still water?

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  1. 17 March, 22:03
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    Speed of the boat = u

    speed of the current = v

    In downstream,

    u - v = 280/7

    u - v = 40

    In upstream,

    u + v = 280/14

    u + v = 20

    Add both equations

    2u = 60

    u = 30

    v = - 10

    Speed of the boat = 30 km/h
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