A commercial van covers 1/3 of a route sector distance at 20 km/h, 1/3 at 40 km/h and the final 1/3 segment at 40 km/h. Find the mean average speed. MCQ with Answer and Explanation

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A commercial van covers 1/3 of a route sector distance at 20 km/h, 1/3 at 40 km/h and the final 1/3 segment at 40 km/h. Find the mean average speed.

A. 30 km/h

B. 34 km/h

C. 28 km/h

D. 32 km/h

Answer: Option A

Solution (By JKExamLibrary)

Let each third segment distance be 40 km. Total sector distance = 120 km. Total time = 40/20 + 40/40 + 40/40 = 2 + 1 + 1 = 4 hours. Average speed across route = 120 / 4 = 30 km/h.

This question belongs to: Maths Time Speed and Distance

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Practice More Time Speed and Distance Questions

Question #1 Report Error

Two passenger trains of equal layout lengths cross a station pole in 15 seconds and 30 seconds respectively. If each train length measures 150 meters, find the time parameter required to pass each other completely when tracking in opposite directions.

A. 18 seconds

B. 20 seconds

C. 22 seconds

D. 24 seconds

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Correct Answer: Option B

Explanation:
Speed of first train = 150 / 15 = 10 m/s. Speed of second train = 150 / 30 = 5 m/s. Total passing distance = 150 + 150 = 300 meters. Relative speed in opposite directions = 10 + 5 = 15 m/s. Time required = 300 / 15 = 20 seconds.

This question belongs to: Maths Time Speed and Distance

Question #2 Report Error

A jogger runs along a square perimeter of side 45 meters. If his speed is 10.8 km/h, how much time does he take to finish one full round?

A. 54 seconds

B. 60 seconds

C. 66 seconds

D. 72 seconds

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Correct Answer: Option B

Explanation:
Perimeter of the course = 4 * 45 = 180 meters. Speed = 10.8 km/h = 10.8 * (5/18) = 3 m/s. Time required = Distance / Speed = 180 / 3 = 60 seconds.

This question belongs to: Maths Time Speed and Distance