How many seconds will a train 100 meters long take to cross a bridge 150 meters long if the speed of the train is 72 kmph?	Choose the correct option:
A) 22 sec
B) 77 sec
C) 25 sec
D) 18 sec
E) 12.5 sec

Rationale: "d = 100 + 150 = 250 s = 72 * 5 / 18 = 20 mps t = 250 / 20 = 12.5 sec answer : e"
Answer: E