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Pawan can row 24 km/h in still water. When the river is running at 4.8 km/h, it takes him 1 h to row to a place and to come back. How far is the place?


A) 11.52 km

B) 14 km

C) 12.52 km

D) 15 km

Correct Answer:
A) 11.52 km

Description for Correct answer:
Pawan's speed downstream = 24 + 4.8 = 28.8 km/h

Pawan's speed upstream = 24 - 4.8 = 19.2 km/h

Let the required distance be x.

According to the question,

\( \Large \frac{x}{28.8}+\frac{x}{19.2}=1 \)

\( \Large \frac{19.2x + 28.8x}{552.96} = 1 \)

\( \Large 19.2x + 28.8x = 552.96 \)

\( \Large 48x = 552.96 \)

\( \Large x = \frac{552.96}{48} \) = 11.52 km

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