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Mathematics, 04.12.2020 21:10 lLavenderl

Helmut can paddle in still water at a speed of 4 km/h. If he paddled 10 km upstream against the current and then paddled 10 km back downstream with the current, and the total trip
took 9 h, what is the speed of the current?

please help

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Helmut can paddle in still water at a speed of 4 km/h. If he paddled 10 km upstream against the cur...

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