Mathematics, 20.01.2021 23:20 fancycar14

Please help. A motorboat travels 35 km in 2 hours with the river's current, the same motorboat travels 39 km in 3 hours in a lake. please find the speed of the current. thanks!

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Please help. A motorboat travels 35 km in 2 hours with the river's current, the same motorboat trave...