A train passes a standing man in 10 seconds and a platform 300 meters long in 25 seconds. Find the length of the train. MCQ with Answer and Explanation
A train passes a standing man in 10 seconds and a platform 300 meters long in 25 seconds. Find the length of the train.
A. 150 meters
B. 200 meters
C. 250 meters
D. 300 meters
Answer: Option A
Solution (By JKSSB Mock Tests)
The train takes 25 - 10 = 15 seconds to cover the length of the platform. Speed of the train = 300 / 15 = 20 m/s. Length of the train = Speed * Time to cross the man = 20 * 10 = 150 meters.
Explanation:
New Speed = 3/4 of usual speed, so New Time = 4/3 of usual time. Change in time = 4/3 * T - T = 1/3 * T = 20 minutes. Usual time T = 60 minutes.
Explanation:
The second man covers 10 meters in 2 seconds, so his speed = 10 / 2 = 5 m/s. Total time taken by second man to complete 100m = 100 / 5 = 20 seconds. Since the winner beats him by 2 seconds, winner's time = 20 - 2 = 18 seconds.
A transport van tracks from terminal X to Y at 40 km/h and handles the return trip route back to X at 60 km/h. What is the average speed recorded across the full round journey?
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