A 280 m long train is running at a speed of 54 km/h. In how much time (in seconds) will it cross a man moving at 12 km/h in the same direction as that of the train?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 24.
Relative speed (same direction) = 54 − 12 = 42 km/h
42 × (5/18) = 11.67 m/s
Time = Distance ÷ Speed = 280/11.67 = 24 seconds