A person row a boat 30 km downstream in 3 hours and returns upstream in 5 hours. Find the speed of the current. MCQ with Answer and Explanation

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A person row a boat 30 km downstream in 3 hours and returns upstream in 5 hours. Find the speed of the current.

A. 1.5 km/h

B. 3.0 km/h

C. 2.5 km/h

D. 2.0 km/h

Answer: Option D

Solution (By JKSSB Mock Tests)

Downstream speed = 30 / 3 = 10 km/h. Upstream speed = 30 / 5 = 6 km/h. Speed of current = (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 train passes a static observer in 6 seconds and a platform 160 meters long in 14 seconds. Find the length of the train.

A. 140 meters

B. 150 meters

C. 100 meters

D. 120 meters

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Correct Answer: Option D

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

This question belongs to: Maths Time Speed and Distance

Question #2

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A field clerk walking at 5 km/h handles a regular sector. If he steps up to run at 10 km/h, he takes 24 minutes less across the course stretch. Find the absolute distance profile.

A. 5.0 km

B. 4.0 km

C. 3.5 km

D. 4.5 km

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Correct Answer: Option B

Explanation:
Time difference = 24 minutes = 24/60 = 2/5 hours. Let distance be d. d / 5 - d / 10 = 2/5 => d / 10 = 2/5 => d = 4 km.

This question belongs to: Maths Time Speed and Distance

Question #3

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Excluding stoppages, the speed of a bus is 54 km/h and including stoppages, it is 45 km/h. For how many minutes does the bus stop per hour?

A. 9 minutes

B. 15 minutes

C. 10 minutes

D. 12 minutes

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Correct Answer: Option C

Explanation:
Stoppage time per hour = (Fast Speed - Slow Speed) / Fast Speed = (54 - 45) / 54 = 9 / 54 = 1/6 hour. In minutes = (1/6) * 60 = 10 minutes.

This question belongs to: Maths Time Speed and Distance

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