Walking at 4/5 of his normal pace, an official is 12 minutes late to his assignment station. Find his usual baseline time. MCQ with Answer and Explanation

Question

Walking at 4/5 of his normal pace, an official is 12 minutes late to his assignment station. Find his usual baseline time.

A. 52 minutes

B. 48 minutes

C. 44 minutes

D. 56 minutes

Answer: Option B

Solution (By JKSSB Mock Tests)

New speed = 4/5 of usual speed => New time = 5/4 of usual time. Difference = 1/4 of usual time = 12 minutes. Usual time = 12 * 4 = 48 minutes.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A car covers a certain distance at 54 km/h in 4 hours. How much time will it take to cover the same distance at 72 km/h?

A. 3 hours

B. 4 hours

C. 3.5 hours

D. 2.5 hours

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Correct Answer: Option A

Explanation:
Distance = 54 * 4 = 216 km. New time required = 216 / 72 = 3 hours.

This question belongs to: Maths Time Speed and Distance

Question #2

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A passenger train 100 meters long clears a line worker tracking on the ballast track in 5 seconds flat when both move along the identical direction. If the line worker walks at 8 km/h, find the train speed.

A. 80 km/h

B. 88 km/h

C. 76 km/h

D. 84 km/h

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Correct Answer: Option A

Explanation:
Relative tracking speed = 100 / 5 = 20 m/s = 20 * (18/5) = 72 km/h. In identical directions, Relative Speed = Speed of train - Speed of worker => 72 = Speed of train - 8 => Speed of train = 80 km/h.

This question belongs to: Maths Time Speed and Distance