How long does a train 110 meters long running at the speed of 72 km/hour take to cross a bridge 132 meters in length ?	Choose the most appropriate option:  A) 15 seconds  B) 12.1 seconds  C) 10 seconds  D) 8.1 seconds  E) none of these

Rationale: "explanation : speed = 72 km / hour = 72 * ( 5 / 18 ) m / sec = 20 m / sec total distance to be covered = 110 + 132 = 142 meters time = distance / speed = 242 / 20 = 12.1 seconds option b"
Answer: B