Solve this multiple-choice question and choose the correct option.

Sameer can row a certain distance downstream in 24 h and can come back covering the same distance in 36 h. If the stream flows at the rate of 12 km/h, find the speed of Sameer in still water?

30 km/h
15 km/h
40 km/h
60 km/h

Correct Answer: 60 km/h

Explanation:

Let the speed of Sameer in still water be x km/h Sameer's speed downstream = (x + 12) km/h Sameer's speed upstream = (x - 12) km/h According to the question, 24(x + 12) = 36(x - 12) ⇒ 2x + 24 = 3x - 36 ⇒ x = 36 + 24 = 60 km/h

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