A 250 m long train is running at a speed of 55 Km/hr. It crossed a platform of length 520 m in ? Choose the correct answer
A) 41.1 sec
B) 20.2 sec
C) 31.8 sec
D) 50.4 sec
E) none of the above
Speed = 55 Km/hr   (to convert km/hr in to M/s)   = 55 x 5/18 M/s   50.4 secistance = 250 m + 520 m ( If questions is about train crossing a post you need to consider only the length of Train, )   = 770 m   Time = 50.4 secistance / Speed   = 770 x 18 / (5 x 55)   = 50.4 sec   Ans is :50.4 sec
<result>D</result>
A 250 m long train is running at a speed of 55 Km/hr. It crossed a platform of length 520 m in ?