A 140 m long train is running at a speed of 55 Km/hr. It crossed a platform of length 520 m in ?	Choose the correct choice from the following options
A) 41.1 sec	B) 20.2 sec	C) 31.8 sec	D) 43.2 sec	E) none of the above

Rationale: speed = 55 km / hr ( to convert km / hr in to m / s ) = 55 x 5 / 18 m / s distance = 140 m + 520 m ( if questions is about train crossing a post you need to consider only the length of train , ) = 660 m time = distance / speed = 660 x 18 / ( 5 x 55 ) = 43.2 sec ans is : d
Answer: D