Rowing upstream, Kartik passes a floating log at a bridge. After rowing on for 1 hour he turns round and, rowing with the same effort, catches up with the log 6 km below the bridge. What is the speed of the river?

Question

Accepted Answer

3 km/h. Relative to the water the log is still, so Kartik takes as long to come back (1 h) as he spent going away (1 h). The log drifted 6 km in 2 h ⇒ 3 km/h.

Rowing upstream, Kartik passes a floating log at a bridge. After rowing on for 1 hour he turns round and, rowing with the same effort, catches up with the log 6 km below the bridge. What is the speed of the river?

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