A train 120 meters long crosses an electrical signal pole in 6 seconds. Find its speed in km/h. MCQ with Answer and Explanation

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A train 120 meters long crosses an electrical signal pole in 6 seconds. Find its speed in km/h.

A. 84 km/h

B. 72 km/h

C. 80 km/h

D. 64 km/h

Answer: Option B

Solution (By JKSSB Mock Tests)

Speed = 120 / 6 = 20 m/s. Converting to km/h = 20 * (18/5) = 72 km/h.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A car travels a distance of 300 km at a certain speed. If the speed is increased by 15 km/h, it takes 4 hours for the journey. Find the original speed.

A. 60 km/h

B. 65 km/h

C. 55 km/h

D. 70 km/h

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Correct Answer: Option A

Explanation:
New speed = 300 / 4 = 75 km/h. Since new speed is original speed + 15 km/h, the original speed = 75 - 15 = 60 km/h.

This question belongs to: Maths Time Speed and Distance

Question #2

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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. 2.5 km/h

B. 2.0 km/h

C. 1.5 km/h

D. 3.0 km/h

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Correct Answer: Option B

Explanation:
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

Question #3

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A car covers a certain distance at 54 km/h in 4 hours. How much time will it take to cover the same distance at 72 km/h?

A. 4 hours

B. 3 hours

C. 2.5 hours

D. 3.5 hours

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Correct Answer: Option B

Explanation:
Distance = 54 * 4 = 216 km. New time required = 216 / 72 = 3 hours.

This question belongs to: Maths Time Speed and Distance

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