A man rows upstream 13 km and downstream 28 km, taking 5 hours each time. Find the speed of the stream. MCQ with Answer and Explanation

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A man rows upstream 13 km and downstream 28 km, taking 5 hours each time. Find the speed of the stream.

A. 2 km/h

B. 3 km/h

C. 2.5 km/h

D. 1.5 km/h

Answer: Option D

Solution (By JKSSB Mock Tests)

Upstream speed = 13 / 5 = 2.6 km/h. Downstream speed = 28 / 5 = 5.6 km/h. Speed of stream = (Downstream speed - Upstream speed) / 2 = (5.6 - 2.6) / 2 = 3 / 2 = 1.5 km/h.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A car travels at a speed of 54 km/h. What is its speed expressed in meters per second?

A. 15 m/s

B. 18 m/s

C. 12 m/s

D. 10 m/s

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Correct Answer: Option A

Explanation:
To convert km/h to m/s, multiply by 5/18. Speed = 54 * (5/18) = 3 * 5 = 15 m/s.

This question belongs to: Maths Time Speed and Distance

Question #2

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Walking at 3/5 of his normal speed, a person is 20 minutes late to his destination. What is his normal time?

A. 25 minutes

B. 30 minutes

C. 35 minutes

D. 40 minutes

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Correct Answer: Option B

Explanation:
New speed = 3/5 of normal speed => New time = 5/3 of normal time. Difference = 2/3 of normal time = 20 minutes. Normal time = (20 * 3) / 2 = 30 minutes.

This question belongs to: Maths Time Speed and Distance

Question #3

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A train passes a static observer in 8 seconds and a platform 120 meters long in 14 seconds. Find the length of the train.

A. 180 meters

B. 150 meters

C. 200 meters

D. 160 meters

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Correct Answer: Option D

Explanation:
Time to cross the platform alone = 14 - 8 = 6 seconds. Speed of train = 120 / 6 = 20 m/s. Length of train = Speed * Time to pass observer = 20 * 8 = 160 meters.

This question belongs to: Maths Time Speed and Distance

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