A 470 m long train is running at a speed of 55 Km/hr. It crossed a platform of length 520 m in ?	Options.
A) 41.1 sec B) 64.8 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 = 470 m + 520 m ( If questions is about train crossing a post you need to consider only the length of Train, )   = 990 m   Time = Distance / Speed   = 990 x 18 / (5 x 55)   = 64.8 sec   Ans is :64.8 sec
<result>B</result>
A 470 m long train is running at a speed of 55 Km/hr. It crossed a platform of length 520 m in ?