How long does a train 100 m long running at the speed of 80 km/hr takes to cross a bridge 142 m length? Choose the correct answer:  A) 10.7 sec  B) 10.9 sec  C) 10.1 sec  D) 15.1 sec  E) 12.7 sec

Rationale: "speed = 80 * 5 / 18 = 22.2 m / sec total distance covered = 100 + 142 = 242 m . required time = 242 / 22.2 ' = 10.9 sec . answer : b"
Answer: B