A cargo truck covers the first 4 hours of its route at 60 km/h and the remaining 3 hours at 70 km/h. Find the net average speed. MCQ with Answer and Explanation

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A cargo truck covers the first 4 hours of its route at 60 km/h and the remaining 3 hours at 70 km/h. Find the net average speed.

A. 66.00 km/h

B. 63.25 km/h

C. 65.50 km/h

D. 64.28 km/h

Answer: Option D

Solution (By JKExamLibrary)

Distance 1 = 60 * 4 = 240 km. Distance 2 = 70 * 3 = 210 km. Total distance = 240 + 210 = 450 km. Total time = 4 + 3 = 7 hours. Average speed = 450 / 7 = 64.28 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

The speed of two trains are in the ratio 4 : 5. If the second train covers 300 km in 3 hours, find the speed of the first train.

A. 85 km/h

B. 75 km/h

C. 90 km/h

D. 80 km/h

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Correct Answer: Option D

Explanation:
Speed of the second train = 300 / 3 = 100 km/h. Speed ratio is 4:5, so 5 parts = 100 km/h => 1 part = 20 km/h. Speed of the first train = 4 parts = 4 * 20 = 80 km/h.

This question belongs to: Maths Time Speed and Distance

Question #2 Report Error

A man can walk a certain distance in 6 hours and ride back in 2 hours. If he rides both ways, he will save 2 hours. How much time will he take if he walks both ways?

A. 10 hours

B. 12 hours

C. 8 hours

D. 14 hours

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Correct Answer: Option A

Explanation:
Let W be walking time one way and R be riding time one way. W + R = 6 + 2 = 8 hours (total trip: walk one way, ride back). If he rides both ways, total time is 2R. He saves 2 hours, so 2R = 8 - 2 = 6 hours => R = 3 hours. From W + R = 8, W = 5 hours. Walking both ways takes 2W = 10 hours.

This question belongs to: Maths Time Speed and Distance