A car travels from A to B at 45 km/h and returns to A at 55 km/h. What is the approximate average speed for the round journey? MCQ with Answer and Explanation

Question

A car travels from A to B at 45 km/h and returns to A at 55 km/h. What is the approximate average speed for the round journey?

A. 51.4 km/h

B. 48.2 km/h

C. 50.0 km/h

D. 49.5 km/h

Answer: Option D

Solution (By JKSSB Mock Tests)

Average Speed = 2xy / (x + y) = (2 * 45 * 55) / (45 + 55) = 4950 / 100 = 49.5 km/h.

This question belongs to: Maths Time Speed and Distance

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Question #1

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Excluding stoppages, a bus travels at 54 km/h and including stoppages it travels at 45 km/h. How many minutes does the bus stop per hour?

A. 12 minutes

B. 10 minutes

C. 15 minutes

D. 8 minutes

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Correct Answer: Option B

Explanation:
Stoppage time per hour = (54 - 45) / 54 = 9 / 54 = 1/6 hour. In minutes = (1/6) * 60 = 10 minutes.

This question belongs to: Maths Time Speed and Distance

Question #2

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A cyclist covers a 1500-meter course in 5 minutes. Find his speed in km/h.

A. 18 km/h

B. 24 km/h

C. 20 km/h

D. 15 km/h

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Correct Answer: Option A

Explanation:
Time = 5 minutes = 300 seconds. Speed = 1500 / 300 = 5 m/s. Converting to km/h = 5 * (18/5) = 18 km/h.

This question belongs to: Maths Time Speed and Distance

Question #3

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A person crosses a 500-meter long bridge in 4 minutes. Find his speed in km/h.

A. 7.5 km/h

B. 6.5 km/h

C. 8.5 km/h

D. 8.0 km/h

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Correct Answer: Option A

Explanation:
Time = 4 minutes = 240 seconds. Speed = 500 / 240 = 25/12 m/s. In km/h = (25/12) * (18/5) = 5 * 1.5 = 7.5 km/h.

This question belongs to: Maths Time Speed and Distance

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