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SSC CHSL 2024 PYQ — Question 51

SSC CHSL - 01 July 2024 - Shift 3 • Quantitative Aptitude • Q51

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A man can row 18 km/h in still water. It takes him two times as long to row up as to row down the river. Find the rate of the stream.

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Correct answer: B

Explanation

The correct answer is option 2 i.e. 6 km/h.

Speed of the man in still water = 18 km/h

Speed of the stream = x km/h

Speed of the man downstream = 18 + x km/h

Speed of the man upstream = 18 − x km/h

Time = Distance​Speed\frac{Distance​}{Speed}

According to the question:-

⇒ Distance​18−x=2×Distance​​18+x\frac{Distance​}{18 - x} = 2 × \frac{Distance​​}{18 + x}

⇒ 18 + x = 2(18 − x)

⇒ 18 + x = 36 − 2x

⇒ x + 2x = 36 − 18

⇒ 3x = 18

⇒ x = 183\frac{18}{3} = 6 km/h