How long does a train 100 m long travelling at 60 kmph takes to cross a bridge of 80 m in length?	Choose one:
A) 15.8 sec
B) 14.9 sec
C) 12.4 sec
D) 10.8 sec
E) 11.8 sec

Rationale: "d 16.8 sec d = 100 + 80 = 180 m s = 60 * 5 / 18 = 50 / 3 t = 180 * 3 / 50 = 10.8 sec"
Answer: D