A 140 m long train is running at a speed of 55 Km/hr. It crossed a platform of length 520 m in ?
Choices
A) 41.1 sec	B) 20.2 sec	C) 31.8 sec	D) 43.2 sec	E) none of the above
Speed = 55 Km/hr   (to convert km/hr in to M/s)   = 55 x 5/18 M/s   43.2 secistance = 140 m + 520 m ( If questions is about train crossing a post you need to consider only the length of Train, )   = 660 m   Time = 43.2 secistance / Speed   = 660 x 18 / (5 x 55)   = 43.2 sec   Ans is :43.2 sec
<result>D</result>
A 140 m long train is running at a speed of 55 Km/hr. It crossed a platform of length 520 m in ?