A man rows upstream 10 km and downstream 22 km, taking 3 hours each way. Find the speed of the current. MCQ with Answer and Explanation

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A man rows upstream 10 km and downstream 22 km, taking 3 hours each way. Find the speed of the current.

A. 2.0 km/h

B. 2.2 km/h

C. 1.8 km/h

D. 2.5 km/h

Answer: Option A

Solution (By JKSSB Mock Tests)

Upstream speed = 10 / 3 = 3.33 km/h. Downstream speed = 22 / 3 = 7.33 km/h. Speed of current = (Downstream speed - Upstream speed) / 2 = (7.33 - 3.33) / 2 = 4 / 2 = 2 km/h.

This question belongs to: Maths Time Speed and Distance

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Question #1

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Walking at 4/5 of his normal pace, an official is 12 minutes late to his assignment station. Find his usual baseline time.

A. 44 minutes

B. 48 minutes

C. 52 minutes

D. 56 minutes

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Correct Answer: Option B

Explanation:
New speed = 4/5 of usual speed => New time = 5/4 of usual time. Difference = 1/4 of usual time = 12 minutes. Usual time = 12 * 4 = 48 minutes.

This question belongs to: Maths Time Speed and Distance