A 480 m long train is running at a speed of 55 Km/hr. It crossed a platform of length 620 m in ?	Choose one.
A) 41.1 sec	B) 72 sec	C) 31.8 sec	D) 50.4 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 = 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 : b"
Answer: B