Correct Answer - Option 3 : 144 seconds
Given:
Length of train = 800 m
Speed of train = 55 km/h
Length of platform = 1400 m
Formula used:
Speed = (Length of train + Length of platform)/Time
Calculations:
Speed = (Length of train + Length of platform)/Time
⇒ Speed = (800 + 1400)/Time
⇒ (55 × 5/18) = 2200/Time
⇒ Time = 39600/(55 × 5)
⇒ Time = 144 seconds
∴ In 144 seconds it can cross a 1400 m long platform.
