Going downstream, a motorboat passes a raft at point P. Thirty minutes later the boat turns back and, with the engine unchanged, meets the raft 2 km below P. What is the speed of the current?

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Accepted Answer

2 km/h. In the water's frame the raft is still, so the boat needs 30 minutes back as well. The raft drifts 2 km in 1 hour ⇒ 2 km/h.

Going downstream, a motorboat passes a raft at point P. Thirty minutes later the boat turns back and, with the engine unchanged, meets the raft 2 km below P. What is the speed of the current?

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