A car covers a total distance of 180 km. It travels the first half of the distance at 30 km/h and the second half at 60 km/h. Find the average speed for the full journey. MCQ with Answer and Explanation

Question

A car covers a total distance of 180 km. It travels the first half of the distance at 30 km/h and the second half at 60 km/h. Find the average speed for the full journey.

A. 40 km/h

B. 36 km/h

C. 45 km/h

D. 50 km/h

Answer: Option A

Solution (By JKSSB Mock Tests)

Average Speed = 2xy / (x + y) = (2 * 30 * 60) / (30 + 60) = 3600 / 90 = 40 km/h.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A person walking at 4 km/h covers a certain distance. If he runs at 8 km/h, he takes 30 minutes less to cover the same distance. Find the distance.

A. 4.5 km

B. 5.0 km

C. 4.0 km

D. 3.5 km

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Correct Answer: Option C

Explanation:
Time difference = 30 minutes = 0.5 hours. Let distance be d. d / 4 - d / 8 = 0.5 => d / 8 = 0.5 => d = 4 km.

This question belongs to: Maths Time Speed and Distance

Question #2

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A man can row 10 km/h in still water. When the river runs at 2 km/h, it takes him 5 hours to row to a place and come back. Find the distance of the place.

A. 28 km

B. 30 km

C. 20 km

D. 24 km

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Correct Answer: Option D

Explanation:
Downstream speed = 10 + 2 = 12 km/h. Upstream speed = 10 - 2 = 8 km/h. Let distance be d. d/12 + d/8 = 5 => (2d + 3d)/24 = 5 => 5d/24 = 5 => d = 24 km.

This question belongs to: Maths Time Speed and Distance