A man rows upstream 14 km and downstream 26 km, taking 4 hours each time. Find the speed of the current. MCQ with Answer and Explanation

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A man rows upstream 14 km and downstream 26 km, taking 4 hours each time. Find the speed of the current.

A. 1.50 km/h

B. 2.00 km/h

C. 1.25 km/h

D. 1.75 km/h

Answer: Option A

Solution (By JKExamLibrary)

Upstream speed = 14 / 4 = 3.5 km/h. Downstream speed = 26 / 4 = 6.5 km/h. Speed of current = (Downstream speed - Upstream speed) / 2 = (6.5 - 3.5) / 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 tracks a total segment of 360 km. If the uniform speed is boosted by 15 km/h, it covers the course in 4 hours flat. Find the original speed.

A. 85 km/h

B. 80 km/h

C. 75 km/h

D. 70 km/h

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Correct Answer: Option C

Explanation:
New speed = 360 / 4 = 90 km/h. Since the new speed is 15 km/h faster than original speed, original speed = 90 - 15 = 75 km/h.

This question belongs to: Maths Time Speed and Distance

Question #2

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A train 100 meters long running at 54 km/h passes a standing pedestrian. Find the time taken to cross.

A. 6.66 seconds

B. 8.0 seconds

C. 6.0 seconds

D. 7.2 seconds

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Correct Answer: Option A

Explanation:
Speed of train = 54 * (5/18) = 15 m/s. Time taken = 100 / 15 = 6.66 seconds.

This question belongs to: Maths Time Speed and Distance

Question #3

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In a 600-meter race, A finishes in 66 seconds and B finishes in 75 seconds. By what distance does A beat B?

A. 75 meters

B. 72 meters

C. 80 meters

D. 68 meters

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Correct Answer: Option B

Explanation:
Speed of B = 600 / 75 = 8 m/s. Distance covered by B when A crosses the finish line at 66 seconds = 8 * 66 = 528 meters. Winning margin = 600 - 528 = 72 meters.

This question belongs to: Maths Time Speed and Distance

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