A 415 m long train is running at 63 km/hr. In how much time will it cross a tunnel 285 m long?  Choose one.
A) 25
B) 35
C) 45
D) 60
E) 40

Rationale: "speed of the train = ( 63 * 5 / 18 ) m / sec = 35 / 2 m / sec . distance travelled = ( speed x time ) time = ( distance travelled / speed ) distance travelled = length of the train + length of the tunnel = 415 + 285 = 700 m time = ( 700 / 35 / 2 ) = 40 sec answer : e"
Answer: E