A 360 m long train is running at a speed of 55 Km/hr. It crossed a platform of length 520 m in ?
Choose the most appropriate option
A) 57.6 sec
B) 20.2 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 = 360 m + 520 m ( if questions is about train crossing a post you need to consider only the length of train , ) = 880 m time = distance / speed = 880 x 18 / ( 5 x 55 ) = 57.6 sec ans is : a"
Answer: A