A man walks a certain distance at a speed of 4 km/h and runs back at 16 km/h. Find his average speed. MCQ with Answer and Explanation

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A man walks a certain distance at a speed of 4 km/h and runs back at 16 km/h. Find his average speed.

A. 9.6 km/h

B. 8 km/h

C. 10 km/h

D. 6.4 km/h

Answer: Option D

Solution (By JKSSB Mock Tests)

Average Speed = (2 * 4 * 16) / (4 + 16) = 128 / 20 = 6.4 km/h.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A vehicle runs at 30 km/h for 3 hours and 60 km/h for the next 2 hours. Find the average speed for the whole journey.

A. 42 km/h

B. 45 km/h

C. 48 km/h

D. 40 km/h

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Correct Answer: Option A

Explanation:
Distance 1 = 30 * 3 = 90 km. Distance 2 = 60 * 2 = 120 km. Total distance = 210 km. Total time = 3 + 2 = 5 hours. Average speed = 210 / 5 = 42 km/h.

This question belongs to: Maths Time Speed and Distance

Question #2

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A train running at 90 km/h overtakes a cyclist riding at 18 km/h in the same direction in 10 seconds. Find the length of the train.

A. 180 meters

B. 220 meters

C. 240 meters

D. 200 meters

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Correct Answer: Option D

Explanation:
Relative speed = 90 - 18 = 72 km/h = 72 * (5/18) = 20 m/s. Length of train = Relative speed * Time = 20 * 10 = 200 meters.

This question belongs to: Maths Time Speed and Distance

Question #3

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Walking at 6/7 of his usual speed, a man is 15 minutes late to his destination. What is his usual time to reach the destination?

A. 120 minutes

B. 75 minutes

C. 100 minutes

D. 90 minutes

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Correct Answer: Option D

Explanation:
New speed = 6/7 of usual speed => New time = 7/6 of usual time. Difference = 1/6 of usual time = 15 minutes. Usual time = 15 * 6 = 90 minutes.

This question belongs to: Maths Time Speed and Distance

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