A train running at 54 km/h passes an active signal pole in 12 seconds. Find the length of the train. MCQ with Answer and Explanation

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A train running at 54 km/h passes an active signal pole in 12 seconds. Find the length of the train.

A. 200 meters

B. 180 meters

C. 160 meters

D. 220 meters

Answer: Option B

Solution (By JKSSB Mock Tests)

Speed = 54 * (5/18) = 15 m/s. Length of train = Speed * Time = 15 * 12 = 180 meters.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A man rows a boat 18 km in 4 hours downstream and returns upstream in 12 hours. Find the speed of the stream.

A. 2 km/h

B. 1.5 km/h

C. 1 km/h

D. 2.5 km/h

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Correct Answer: Option B

Explanation:
Downstream speed = 18 / 4 = 4.5 km/h. Upstream speed = 18 / 12 = 1.5 km/h. Speed of stream = (4.5 - 1.5) / 2 = 1.5 km/h.

This question belongs to: Maths Time Speed and Distance

Question #2

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A train crosses a bridge of length 150 meters in 15 seconds and a pole in 9 seconds. What is the length of the train?

A. 225 meters

B. 300 meters

C. 200 meters

D. 250 meters

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Correct Answer: Option A

Explanation:
Let train length be L. Speed = L / 9. Also, Speed = (L + 150) / 15. So, L / 9 = (L + 150) / 15 => 15L = 9L + 1350 => 6L = 1350 => L = 225 meters.

This question belongs to: Maths Time Speed and Distance

Question #3

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A wheel makes 1000 revolutions to cover a distance of 880 meters. Find the diameter of the wheel.

A. 28 cm

B. 32 cm

C. 24 cm

D. 35 cm

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Correct Answer: Option A

Explanation:
Distance covered in 1 revolution = 880 / 1000 = 0.88 meters = 88 cm. Circumference = 2 * (22/7) * r = 88 cm => (44/7) * r = 88 => r = 14 cm. Diameter = 2r = 28 cm.

This question belongs to: Maths Time Speed and Distance

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