A car covers a distance of 120 km at 40 km/h and another 180 km at 60 km/h. Find the average speed for the complete trip. MCQ with Answer and Explanation

Question

A car covers a distance of 120 km at 40 km/h and another 180 km at 60 km/h. Find the average speed for the complete trip.

A. 50 km/h

B. 54 km/h

C. 48 km/h

D. 52 km/h

Answer: Option A

Solution (By JKSSB Mock Tests)

Total distance = 120 + 180 = 300 km. Time 1 = 120 / 40 = 3 hours. Time 2 = 180 / 60 = 3 hours. Total time = 6 hours. Average speed = 300 / 6 = 50 km/h.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A worker reaches his factory 15 minutes late if he walks at 4 km/h, and 10 minutes early if he walks at 6 km/h. Find the distance to his factory.

A. 8 km

B. 6 km

C. 5 km

D. 4 km

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Correct Answer: Option C

Explanation:
Time difference = 15 - (-10) = 25 minutes = 25/60 = 5/12 hour. Let distance be d. d/4 - d/6 = 5/12 => d/12 = 5/12 => d = 5 km.

This question belongs to: Maths Time Speed and Distance

Question #2

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If a student walks from his house to school at 5 km/h, he is late by 10 minutes. However, if he walks at 6 km/h, he is late by only 2 minutes. Find the distance between his house and school.

A. 4 km

B. 5 km

C. 3 km

D. 6 km

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Correct Answer: Option A

Explanation:
Time difference = 10 - 2 = 8 minutes = 8/60 hour = 2/15 hour. Let distance be d. d/5 - d/6 = 2/15 => d/30 = 2/15 => d = 60/15 = 4 km.

This question belongs to: Maths Time Speed and Distance