A car traveling at 60 km/h covers a certain distance in 4 hours. At what speed must it travel to cover the same distance in 3 hours? MCQ with Answer and Explanation

Question

A car traveling at 60 km/h covers a certain distance in 4 hours. At what speed must it travel to cover the same distance in 3 hours?

A. 90 km/h

B. 85 km/h

C. 80 km/h

D. 75 km/h

Answer: Option C

Solution (By JKSSB Mock Tests)

Distance = Speed * Time = 60 * 4 = 240 km. Required Speed = Distance / New Time = 240 / 3 = 80 km/h.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A car travels a distance of 420 km at a certain speed. If the speed is increased by 15 km/h, it takes 5 hours for the journey. Find the original speed.

A. 75 km/h

B. 65 km/h

C. 72 km/h

D. 69 km/h

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Correct Answer: Option D

Explanation:
New speed = 420 / 5 = 84 km/h. Since new speed is original speed + 15 km/h, the original speed = 84 - 15 = 69 km/h.

This question belongs to: Maths Time Speed and Distance

Question #2

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A train 120 meters long passes an active crossing signal point in 6 seconds flat. Find the time interval needed to clear a station platform 240 meters long.

A. 15 seconds

B. 18 seconds

C. 22 seconds

D. 20 seconds

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Correct Answer: Option B

Explanation:
Speed of train = 120 / 6 = 20 m/s. Total distance to clear platform = 120 + 240 = 360 meters. Time required = 360 / 20 = 18 seconds.

This question belongs to: Maths Time Speed and Distance

Question #3

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A train passes a standing man in 6 seconds and a 210-meter long platform in 16 seconds. Find the speed of the train.

A. 75.6 km/h

B. 80 km/h

C. 54 km/h

D. 72 km/h

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Correct Answer: Option A

Explanation:
Let length of train be L. Speed = L/6. Also, Speed = (L + 210)/16. Equating them: L/6 = (L+210)/16 => 16L = 6L + 1260 => 10L = 1260 => L = 126 meters. Speed = 126 / 6 = 21 m/s. Speed in km/h = 21 * (18/5) = 378 / 5 = 75.6 km/h.

This question belongs to: Maths Time Speed and Distance

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