How many seconds will a train 100 meters long take to cross a bridge 150 meters long if the speed of the train is 54 kmph?  Choose the correct answer:
A) 22 sec
B) 77 sec
C) 16.7 sec
D) 18 sec
E) 17 sec

Rationale: "d = 100 + 150 = 250 s = 54 * 5 / 18 = 15 mps t = 250 / 15 = 16.7 sec answer : c"
Answer: C