The length of platform is double of the length of train. Speed of the train is 144 km/hr. If train crosses the platform in 30 seconds, then what is the length of the platform?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 800 metres
Let the length of train be X and length of Platform will be 2X.
Speed = Distance/Time
Speed = 144km/h or 144 × 5/18 = 40m/s.
Time = 30Secs
Distance to be covered = X + 2X = 3X.
40 = 3X/30
⇒1200 = 3X
X = 400
Length of Platform = 2X i.e 2 × 400 = 800