How long does a train 110 m long running at a speed of 72 kmph take to cross a bridge 132 m in length?  Choices:
A) 9.8 sec
B) 12.1 sec
C) 12.42 sec
D) 14.3 sec
E) 24.3 sec

Rationale: "72 km / hr = 72 * 5 / 18 m / sec = 20 m / sec time = d / s = 110 + 132 / 20 = 242 / 20 = 12.1 sec answer : b"
Answer: B