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. 2.5 kmph

B. 3 kmph

C. 3.5 kmph

D. 2 kmph

Answer: Option B

Solution (By JKExamLibrary)

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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Question #1

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A number increased by 30% then decreased by 30% gives 273. Original number:

A. 280

B. 290

C. 310

D. 300

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Correct Answer: Option D

Explanation:
x × 1.3 × 0.7 = 0.91x = 273 → x = 300.

This question belongs to: Maths Percentage

Question #2

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A man's salary increased by 33.33% and then decreased by 25%. His net change in salary is:

A. No change

B. 5% decrease

C. 10% decrease

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Correct Answer: Option A

Explanation:
33.33% = 1/3. Multiplier = (4/3)×(3/4)=1, no change.

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Question #3

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A number is decreased by 10% and then the new number is increased by 20%. If the resulting number is 540, find the original number.

A. 500

B. 450

C. 480

D. 520

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Correct Answer: Option A

Explanation:
0.9 × 1.2 = 1.08, 1.08x = 540 → x = 500.

This question belongs to: Maths Percentage

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