Ques:- A train 100 meters long passes a platform 100 meters long in seconds. The speed of the train is
A. 36 km/hr
B. 52 km/hr
C. 72 km/hr
D. 92 km/hr
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1sec for crossing then ans is 720km/hr
If 10 sec then ans is 72km/hr
In order for the train to pass the whole platform’ it will have to pass 200 meters.
Hence 200m/1 -> 200m*3600/1*3600 -> 720km/hr
= 100 + 100 = 200 m
Time taken by train = 10 sec.
∵ Speed = Distance/Time
⇒ Speed of train = 200/10 = 20 m/sec.
∴ Speed of train = 20 × 18/5 = 72 kmph.
In question they left 10 seconds