How long does a train 120 m long running at the speed of 70 km/hr takes to cross a bridge 145 m length?	Choose the correct choice from the following answers: A) 13.9 sec B) 12.1 sec C) 17.9 sec D) 13.9 sec E) 47.98 sec

Rationale: "speed = 70 * 5 / 18 = 19 m / sec total distance covered = 120 + 145 = 265 m . required time = 265 / 19 = 13.9 sec . answer : d"
Answer: D