Walking at 4/5 of his normal pace, an editor reaches his office 15 minutes late. What is his exact normal time to reach the office? MCQ with Answer and Explanation

Question

Walking at 4/5 of his normal pace, an editor reaches his office 15 minutes late. What is his exact normal time to reach the office?

A. 60 minutes

B. 70 minutes

C. 55 minutes

D. 65 minutes

Answer: Option A

Solution (By JKSSB Mock Tests)

New speed = 4/5 of usual speed => New time = 5/4 of usual time. Difference = 1/4 of usual time = 15 minutes. Normal time = 15 * 4 = 60 minutes.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A bicycle wheel has a radius of 28 cm. How many revolutions are mandatory to span a total course line of 880 meters?

A. 600

B. 450

C. 500

D. 550

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Correct Answer: Option C

Explanation:
Circumference = 2 * (22/7) * 28 = 176 cm = 1.76 meters. Total course line = 880 meters. Number of revolutions = 880 / 1.76 = 500.

This question belongs to: Maths Time Speed and Distance

Question #2

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A train passes a standing passenger in 8 seconds and crosses a 180-meter long platform in 17 seconds. Find the speed of the train.

A. 20 m/s

B. 22 m/s

C. 18 m/s

D. 24 m/s

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Correct Answer: Option A

Explanation:
Time taken to pass the platform alone = 17 - 8 = 9 seconds. Speed of train = 180 / 9 = 20 m/s.

This question belongs to: Maths Time Speed and Distance

Question #3

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A man covers half of his journey at 40 km/h and the remaining half at 60 km/h. What is his average speed?

A. 52 km/h

B. 50 km/h

C. 48 km/h

D. 54 km/h

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Correct Answer: Option C

Explanation:
Average Speed = (2 * 40 * 60) / (40 + 60) = 4800 / 100 = 48 km/h.

This question belongs to: Maths Time Speed and Distance

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