A boat crew rows 30 km upstream and 50 km downstream, taking exactly 5 hours for each independent passage. Find the speed of the current stream. MCQ with Answer and Explanation

Question

A boat crew rows 30 km upstream and 50 km downstream, taking exactly 5 hours for each independent passage. Find the speed of the current stream.

A. 1.5 km/h

B. 3 km/h

C. 2 km/h

D. 2.5 km/h

Answer: Option C

Solution (By JKSSB Mock Tests)

Upstream speed = 30 / 5 = 6 km/h. Downstream speed = 50 / 5 = 10 km/h. Speed of current stream = (Downstream speed - Upstream speed) / 2 = (10 - 6) / 2 = 2 km/h.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A passenger express train 160 meters long runs at 72 km/h. How long will it take to clear a terminal platform 240 meters long?

A. 18 seconds

B. 20 seconds

C. 22 seconds

D. 24 seconds

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Correct Answer: Option B

Explanation:
Speed of train = 72 * (5/18) = 20 m/s. Total distance = 160 + 240 = 400 meters. Time taken = 400 / 20 = 20 seconds.

This question belongs to: Maths Time Speed and Distance

Question #2

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A train 120 meters long passes a signal pole in 6 seconds. Find the time it takes to completely cross a platform 240 meters long.

A. 16 seconds

B. 22 seconds

C. 18 seconds

D. 20 seconds

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Correct Answer: Option C

Explanation:
Speed of train = 120 / 6 = 20 m/s. Total distance to pass platform = 120 + 240 = 360 meters. Time required = 360 / 20 = 18 seconds.

This question belongs to: Maths Time Speed and Distance

Question #3

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A person walks from home to school at 5 km/h and arrives 6 minutes late. If he runs at 6 km/h, he arrives 4 minutes early. Find the distance.

A. 4.5 km

B. 5.5 km

C. 6.0 km

D. 5.0 km

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Correct Answer: Option D

Explanation:
Time difference = 6 - (-4) = 10 minutes = 10/60 = 1/6 hours. Let distance be d. d / 5 - d / 6 = 1/6 => d / 30 = 1/6 => d = 5 km.

This question belongs to: Maths Time Speed and Distance

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