Rowing upstream, Vikram drops his cap into the river. He notices only 15 minutes later, turns round and rows back at the same effort. If the river flows at 2 km/h, how far from where it fell does he pick up the cap?

Question

Accepted Answer

1 km. Relative to the water the cap is still, so he needs another 15 min to get back to it — 30 min in total. In 30 min the cap drifts 2×1/2=1 km. His rowing speed does not matter.

Rowing upstream, Vikram drops his cap into the river. He notices only 15 minutes later, turns round and rows back at the same effort. If the river flows at 2 km/h, how far from where it fell does he pick up the cap?

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