A man can row 9 kmph in still water. It takes him twice as long to row up as to row down the river. Find the rate of the stream. MCQ with Answer and Explanation

Question

A man can row 9 kmph in still water. It takes him twice as long to row up as to row down the river. Find the rate of the stream.

A. 2 kmph

B. 2.5 kmph

C. 3 kmph

D. 3.5 kmph

Answer: Option C

Solution (By JKSSB Mock Tests)

Let stream = s. Speed up = 9-s, down = 9+s. Time up = 2 × time down → distance/(9-s) = 2×distance/(9+s) → 9+s = 2(9-s) → 9+s=18-2s → 3s=9 → s=3 kmph.

This question belongs to: Maths Percentage

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A town's population increases by 10% in the first year and 20% in the second year. What is the net percentage increase?

A. 32%

B. 33%

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Correct Answer: Option A

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In a class of 40, 30% are girls. Number of boys is:

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Correct Answer: Option A

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If a number is increased by 20%, it becomes 120. What is the number?

A. 140

B. 80

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Correct Answer: Option C

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