A jogger runs along a square perimeter of side 45 meters. If his speed is 10.8 km/h, how much time does he take to finish one full round? MCQ with Answer and Explanation

Question

A jogger runs along a square perimeter of side 45 meters. If his speed is 10.8 km/h, how much time does he take to finish one full round?

A. 66 seconds

B. 60 seconds

C. 72 seconds

D. 54 seconds

Answer: Option B

Solution (By JKSSB Mock Tests)

Perimeter of the course = 4 * 45 = 180 meters. Speed = 10.8 km/h = 10.8 * (5/18) = 3 m/s. Time required = Distance / Speed = 180 / 3 = 60 seconds.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A locomotive 180 meters long crosses a modern bridge in 30 seconds. If it takes 12 seconds to pass a single post light, find the length of the bridge.

A. 250 meters

B. 320 meters

C. 270 meters

D. 300 meters

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Correct Answer: Option C

Explanation:
Speed of train = 180 / 12 = 15 m/s. Total distance in 30 seconds = 15 * 30 = 450 meters. Length of bridge = 450 - 180 = 270 meters.

This question belongs to: Maths Time Speed and Distance

Question #2

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A car covers a total loop distance of 300 km. If the baseline speed is raised by 10 km/h, the trip takes 1 hour less. Find the original speed.

A. 50 km/h

B. 55 km/h

C. 60 km/h

D. 45 km/h

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Correct Answer: Option A

Explanation:
Let original speed be s. 300/s - 300/(s+10) = 1 => 3000 = s(s+10). Solving s^2 + 10s - 3000 = 0 yields (s-50)(s+60) = 0. Speed = 50 km/h.

This question belongs to: Maths Time Speed and Distance