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29 July, 18:19

A paddle boat can move at a speed of 2 km/h in still water. The boat is paddled 16 km downstream in a river in the same time it takes to go 8 km upstream. What is the speed of the river?

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  1. 29 July, 20:35
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    going downstream -

    t = 14 / (2 + v)

    going upstream -

    t = 7 / (2 - v)

    14 / (2 + v) = 7 / (2 - v)

    (2 + v) / 2 = 2 - v

    v = 2/3km/h
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