A bicycle wheel of diameter 140 cm makes 300 revolutions in one minute. Find the speed of the bicycle in km/h. MCQ with Answer and Explanation

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A bicycle wheel of diameter 140 cm makes 300 revolutions in one minute. Find the speed of the bicycle in km/h.

A. 82.6 km/h

B. 88.0 km/h

C. 79.2 km/h

D. 75.4 km/h

Answer: Option C

Solution (By JKSSB Mock Tests)

Radius r = 70 cm = 0.7 meters. Circumference = 2 * (22/7) * 0.7 = 4.4 meters. Distance in 1 minute = 300 * 4.4 = 1320 meters. Distance in 1 hour = 1320 * 60 = 79200 meters = 79.2 km. Speed = 79.2 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 an intercity bus is 54 km/h and including stoppages it is 45 km/h. How many minutes does the bus stop per hour?

A. 15 minutes

B. 10 minutes

C. 12 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 train 150 meters long is tracking at 54 km/h. How long will it take to pass a stationary pedestrian?

A. 8 seconds

B. 12 seconds

C. 14 seconds

D. 10 seconds

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Correct Answer: Option D

Explanation:
Speed of train = 54 * (5/18) = 15 m/s. Time taken = 150 / 15 = 10 seconds.

This question belongs to: Maths Time Speed and Distance

Question #3

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A man rows upstream 13 km and downstream 28 km, taking 5 hours each time. Find the speed of the stream.

A. 3 km/h

B. 2 km/h

C. 2.5 km/h

D. 1.5 km/h

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Correct Answer: Option D

Explanation:
Upstream speed = 13 / 5 = 2.6 km/h. Downstream speed = 28 / 5 = 5.6 km/h. Speed of stream = (Downstream speed - Upstream speed) / 2 = (5.6 - 2.6) / 2 = 3 / 2 = 1.5 km/h.

This question belongs to: Maths Time Speed and Distance

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