A truck covers three successive 8 km stretches at uniform speed metrics of 12 km/h, 24 km/h and 24 km/h. Find its net average speed. MCQ with Answer and Explanation

Question

A truck covers three successive 8 km stretches at uniform speed metrics of 12 km/h, 24 km/h and 24 km/h. Find its net average speed.

A. 16 km/h

B. 18 km/h

C. 20 km/h

D. 22 km/h

Answer: Option B

Solution (By JKSSB Mock Tests)

Total distance covered = 3 * 8 = 24 km. Total time taken = 8/12 + 8/24 + 8/24 = 2/3 + 1/3 + 1/3 = 4/3 hours. Average speed = 24 / (4/3) = 24 * 3 / 4 = 6 * 3 = 18 km/h.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A train passes an entry gate sentinel in 7 seconds and handles a 160-meter platform sector in 15 seconds. Find the speed of the train.

A. 20 m/s

B. 24 m/s

C. 22 m/s

D. 18 m/s

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Correct Answer: Option A

Explanation:
Time allocated to cross the platform distance alone = 15 - 7 = 8 seconds. Speed of train = 160 / 8 = 20 m/s.

This question belongs to: Maths Time Speed and Distance

Question #2

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A boat covers 24 km downstream in 2 hours and the same distance upstream in 4 hours. Find the speed of the stream.

A. 2.5 km/h

B. 3.5 km/h

C. 3.0 km/h

D. 4.0 km/h

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Correct Answer: Option C

Explanation:
Downstream speed = 24 / 2 = 12 km/h. Upstream speed = 24 / 4 = 6 km/h. Speed of stream = (12 - 6) / 2 = 3 km/h.

This question belongs to: Maths Time Speed and Distance

Question #3

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A man starts walking from a place P at 4 AM at a speed of 5 km/h. Another man starts from the same place P at 6 AM in the same direction at a speed of 7 km/h. At what time will they meet?

A. 12:00 PM

B. 11:00 AM

C. 10:00 AM

D. 1:00 PM

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Correct Answer: Option B

Explanation:
By 6:00 AM, the first man has traveled for 2 hours, covering 5 * 2 = 10 km. Relative speed = 7 - 5 = 2 km/h. Time to meet = 10 / 2 = 5 hours. Meeting time = 6:00 AM + 5 hours = 11:00 AM.

This question belongs to: Maths Time Speed and Distance

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