A 120 metre long train is running at a speed of 90 km/h. It will cross a 230 m long railway platform in:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 14 sec
To cross a platform, the train must cover its own length plus the platform’s length: the front of the train runs from the start of the platform until the back of the train has left its far end.
Distance to be covered, train and platform together: \(120+230=350\) m
Speed in metres per second (1 km/h \(=\frac{5}{18}\) m/s): \(90\times\frac{5}{18}=25\) m/s
Time, distance divided by speed: \(\frac{350}{25}=14\) s