A person crosses a 500-meter long bridge in 4 minutes. Find his speed in km/h. MCQ with Answer and Explanation

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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

Answer: Option A

Solution (By JKSSB Mock Tests)

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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Question #1

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A wheel makes 2000 revolutions to cover a distance of 1760 meters. Find the radius of the wheel.

A. 18 cm

B. 14 cm

C. 12 cm

D. 16 cm

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Correct Answer: Option B

Explanation:
Distance covered in 1 revolution = 1760 / 2000 = 0.88 meters = 88 cm. Circumference = 2 * (22/7) * r = 88 cm => (44/7) * r = 88 => r = 14 cm.

This question belongs to: Maths Time Speed and Distance

Question #2

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A fugitive breaks out at 3:00 PM moving at 48 km/h. The squad pursues from the same point at 4:30 PM at 64 km/h. At what time will the squad catch the fugitive?

A. 10:00 PM

B. 9:00 PM

C. 9:30 PM

D. 8:30 PM

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Correct Answer: Option B

Explanation:
By 4:30 PM, the fugitive has traveled for 1.5 hours, covering 48 * 1.5 = 72 km. Relative speed = 64 - 48 = 16 km/h. Time to catch = 72 / 16 = 4.5 hours. Catching time = 4:30 PM + 4.5 hours = 9:00 PM.

This question belongs to: Maths Time Speed and Distance

Question #3

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A walk at 5/6 of usual speed makes a person 10 minutes late. What is his usual time?

A. 70 minutes

B. 40 minutes

C. 60 minutes

D. 50 minutes

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Correct Answer: Option D

Explanation:
New Speed = 5/6 of usual speed => New Time = 6/5 of usual time. Difference = 1/5 * Usual Time = 10 minutes => Usual Time = 50 minutes.

This question belongs to: Maths Time Speed and Distance

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