Mathematics, 10.05.2020 04:57 chackey

A motorboat covers the distance from one pier to the other pier in 4 hours and the way back in 5 hours. What is the speed of the boat in still water, if it covers 70 km with the current in 3.5 hours?

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A motorboat covers the distance from one pier to the other pier in 4 hours and the way back in 5 hou...

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