A train running at 90 km/h crosses a platform double its length in 36 seconds. What is the length of the platform? MCQ with Answer and Explanation

Question
A train running at 90 km/h crosses a platform double its length in 36 seconds. What is the length of the platform?
A. 500 meters
B. 600 meters
C. 750 meters
D. 400 meters
Answer: Option B
Solution (By JKSSB Mock Tests)
Speed of train = 90 * (5/18) = 25 m/s. Total distance covered in 36 seconds = 25 * 36 = 900 meters. Let train length be L, so platform length = 2L. L + 2L = 900 => 3L = 900 => L = 300 meters. Platform length = 2L = 600 meters.
This question belongs to: Maths Time Speed and Distance
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Practice More Time Speed and Distance Questions

Question #1
A boat can row 8 km/h in still water. If the river velocity is 4 km/h, find the distance covered downstream by the boat in 45 minutes.
A. 12 km
B. 10 km
C. 8 km
D. 9 km
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Correct Answer: Option D

Explanation:
Downstream speed = 8 + 4 = 12 km/h. Time = 45 minutes = 45/60 = 3/4 hour. Distance covered = Speed * Time = 12 * (3/4) = 9 km.
This question belongs to: Maths Time Speed and Distance
Question #2
An airplane spans a distance of 1800 km at a uniform speed of 600 km/h. Find the time taken to complete the trip.
A. 2 hours
B. 3 hours
C. 3.5 hours
D. 2.5 hours
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Correct Answer: Option B

Explanation:
Time = Distance / Speed = 1800 / 600 = 3 hours.
This question belongs to: Maths Time Speed and Distance
Question #3
A car covers a certain distance at 45 km/h. If it increases its speed to 60 km/h, it arrives 30 minutes earlier. Find the total distance.
A. 100 km
B. 90 km
C. 80 km
D. 120 km
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Correct Answer: Option B

Explanation:
Time difference = 30 minutes = 0.5 hours. Let distance be d. d / 45 - d / 60 = 0.5 => (4d - 3d) / 180 = 0.5 => d / 180 = 0.5 => d = 90 km.
This question belongs to: Maths Time Speed and Distance
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