A 480 m long train is running at a speed of 55 Km/hr. It crossed a platform of length 620 m in ?
Pick:
A) 41.1 sec
B) 72 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   Distance = 480 m + 620 m ( If questions is about train crossing a post you need to consider only the length of Train, )   = 1100 m   Time = Distance / Speed   = 1100 x 18 / (5 x 55)   = 72 sec   Ans is :72 sec
<result>B</result>
A 480 m long train is running at a speed of 55 Km/hr. It crossed a platform of length 620 m in ?