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28 May, 13:59

A boat traveling upstream goes 84 kilometers in 7 hours. If the return trip takes only 3 hours, what is the speed (in kilometers per hour) of the boat still in water?

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  1. 28 May, 16:30
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    Speed = Distance : time

    Speed upstream = 84 : 7 = 12 km/h

    Speed downstream = 84 : 3 = 28 km/h

    Speed in still water = 1/2 (28 + 12) = 20 km/h

    Answer: 20 km/h
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