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Narayan can row at 6 kmph in still water. If the river is running at 2 kmph it takes him 68 minutes to row to a place and come back. How far is the place?

Narayan can row at 6 kmph in still water. If the river is running at 2 kmph it takes him 68 minutes to row to a place and come back. How far is the place? Correct Answer 3.02 kms

Speed downstream = 6 + 2 = 8 kmph

Speed upstream = 6 – 2 = 4 kmph

Let the required distance be x kms

⇒ (x/8) + (x/4) = 68/60 = 17/15

⇒ 4x + 8x = (32 ⨯ 17)/15

⇒ 12x = 544/15

∴ x = 3.02 km

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