A man covers half of his journey at 40 km/h and the remaining half at 60 km/h. What is his average speed? MCQ with Answer and Explanation

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A man covers half of his journey at 40 km/h and the remaining half at 60 km/h. What is his average speed?

A. 48 km/h

B. 50 km/h

C. 54 km/h

D. 52 km/h

Answer: Option A

Solution (By JKSSB Mock Tests)

Average Speed = (2 * 40 * 60) / (40 + 60) = 4800 / 100 = 48 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 regional transit bus is 48 km/h and including stoppages it is 40 km/h. For how many minutes does the bus stop per hour?

A. 8 minutes

B. 12 minutes

C. 15 minutes

D. 10 minutes

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Correct Answer: Option D

Explanation:
Stoppage time per hour = (48 - 40) / 48 = 8 / 48 = 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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If a person covers a distance of 120 km in 3 hours, find his speed in meters per second.

A. 13.33 m/s

B. 11.11 m/s

C. 12.50 m/s

D. 10.5 m/s

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Correct Answer: Option B

Explanation:
Speed = 120 / 3 = 40 km/h. Converting to m/s = 40 * (5/18) = 200 / 18 = 11.11 m/s.

This question belongs to: Maths Time Speed and Distance

Question #3

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A cart wheel turns 1000 revolutions to bridge a sector distance of 1320 meters. Find the diameter size of the turning wheel.

A. 50 cm

B. 42 cm

C. 46 cm

D. 38 cm

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Correct Answer: Option B

Explanation:
Distance covered in 1 single turn revolution = 1320 / 1000 = 1.32 meters = 132 cm. Circumference = 2 * (22/7) * r = 132 cm => Diameter (2r) * (22/7) = 132 => Diameter = 132 * 7 / 22 = 6 * 7 = 42 cm.

This question belongs to: Maths Time Speed and Distance

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