Lag1989 task №1.2

Lag1989 task №1.2

Motorboat, moving against the current of the river, drew level with a raft in paragraph A. 30 minutes after meeting the boat turned back and caught up with the raft in the village. What is the distance between points A and B, if the flow rate of the river 3,5 km / h, and the speed of the boat through the water is constant.

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