A cyclist handles 600 meters in exactly 2 minutes. Find his moving velocity in km/h. MCQ with Answer and Explanation

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A cyclist handles 600 meters in exactly 2 minutes. Find his moving velocity in km/h.

A. 18 km/h

B. 20 km/h

C. 15 km/h

D. 22 km/h

Answer: Option A

Solution (By JKSSB Mock Tests)

Time = 2 minutes = 120 seconds. Speed = 600 / 120 = 5 m/s. In km/h = 5 * (18/5) = 18 km/h.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A wheel of diameter 70 cm makes 400 revolutions per minute. Find the speed of the vehicle in km/h.

A. 48.2 km/h

B. 60.0 km/h

C. 55.4 km/h

D. 52.8 km/h

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Correct Answer: Option D

Explanation:
Radius r = 35 cm = 0.35 meters. Circumference = 2 * (22/7) * 0.35 = 2.2 meters. Distance covered in 1 minute = 400 * 2.2 = 880 meters. Distance covered in 1 hour = 880 * 60 = 52800 meters = 52.8 km. Speed = 52.8 km/h.

This question belongs to: Maths Time Speed and Distance

Question #2

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A man can row 12 km/h in still water. He finds that it takes him twice as long to row upstream as to row downstream. Find the speed of the stream.

A. 3 km/h

B. 4 km/h

C. 6 km/h

D. 5 km/h

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Correct Answer: Option B

Explanation:
Let stream speed be c. Upstream speed = 12 - c, Downstream speed = 12 + c. Given: 2 * (12 - c) = 12 + c => 24 - 2c = 12 + c => 3c = 12 => c = 4 km/h.

This question belongs to: Maths Time Speed and Distance