A train 360 m long runs with a speed of 45 km/hr. What time will it take to pass a platform of 140 m long? Choose the most appropriate option:
A) 38 sec  B) 35 sec  C) 44 sec  D) 40 sec  E) 48 sec

Rationale: "train length = 360 m platform length = 140 m time = ? length = speed * time total length = 360 + 140 = 500 m speed = 45 km / hr = 45 * ( 5 / 18 ) ( m / sec ) = 12.5 m / sec time = length / speed = 500 / 12.5 = 40 sec answer : d"
Answer: D