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. 45 km/h

B. 40 km/h

C. 50 km/h

D. 36 km/h

Answer: Option B

Solution (By JKExamLibrary)

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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Excluding stoppages, the speed of a bus is 55 km/h and including stoppages it is 44 km/h. For how many minutes does the bus stop per hour?

A. 12 minutes

B. 10 minutes

C. 15 minutes

D. 14 minutes

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Correct Answer: Option A

Explanation:
Stoppage time per hour = (55 - 44) / 55 = 11 / 55 = 1/5 hour. In minutes = (1/5) * 60 = 12 minutes.

This question belongs to: Maths Time Speed and Distance

Question #2

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A person row a boat 45 km downstream in 3 hours and manages the return journey upstream in 9 hours. Find the speed of the river current.

A. 5.5 km/h

B. 6.0 km/h

C. 5.0 km/h

D. 4.5 km/h

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Correct Answer: Option C

Explanation:
Downstream speed = 45 / 3 = 15 km/h. Upstream speed = 45 / 9 = 5 km/h. Speed of current = (15 - 5) / 2 = 10 / 2 = 5 km/h.

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Question #3

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Excluding stoppages, a truck travels at 90 km/h and including stoppages it travels at 75 km/h. How many minutes does the truck stop per hour?

A. 8 minutes

B. 10 minutes

C. 12 minutes

D. 15 minutes

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Correct Answer: Option B

Explanation:
Stoppage time per hour = (90 - 75) / 90 = 15 / 90 = 1/6 hour. In minutes = (1/6) * 60 = 10 minutes.

This question belongs to: Maths Time Speed and Distance

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