A swimmer registers 12 km upstream and 24 km downstream, taking 3 hours for each leg of the trials. Find the speed of the current stream. MCQ with Answer and Explanation

Question

A swimmer registers 12 km upstream and 24 km downstream, taking 3 hours for each leg of the trials. Find the speed of the current stream.

A. 2.5 km/h

B. 2.0 km/h

C. 3.0 km/h

D. 1.5 km/h

Answer: Option B

Solution (By JKSSB Mock Tests)

Upstream speed = 12 / 3 = 4 km/h. Downstream speed = 24 / 3 = 8 km/h. Speed of current = (Downstream speed - Upstream speed) / 2 = (8 - 4) / 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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A jogger covers a distance of 18 km in 2 hours. If he runs at 1.5 times his original speed, how much time will he take to cover a distance of 27 km?

A. 2 hours

B. 1.5 hours

C. 2.5 hours

D. 3 hours

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Correct Answer: Option A

Explanation:
Original speed = 18 / 2 = 9 km/h. New speed = 1.5 * 9 = 13.5 km/h. Time needed for 27 km = 27 / 13.5 = 2 hours.

This question belongs to: Maths Time Speed and Distance

Question #2

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An athlete loops a circular running stadium of radius 70 meters in exactly 44 seconds. Find the average moving speed.

A. 14 m/s

B. 12 m/s

C. 8 m/s

D. 10 m/s

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Correct Answer: Option D

Explanation:
Circumference = 2 * (22/7) * 70 = 440 meters. Speed = Distance / Time = 440 / 44 = 10 m/s.

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Question #3

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Two trains 110 meters and 90 meters long are running in opposite directions at speeds of 36 km/h and 54 km/h respectively. In what time will they pass each other completely?

A. 12 seconds

B. 8 seconds

C. 10 seconds

D. 6 seconds

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Correct Answer: Option B

Explanation:
Total distance = 110 + 90 = 200 meters. Relative speed in opposite directions = 36 + 54 = 90 km/h = 90 * (5/18) = 25 m/s. Time taken = 200 / 25 = 8 seconds.

This question belongs to: Maths Time Speed and Distance

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