How long does a train 130 m long running at the speed of 80 km/hr takes to cross a bridge 140 m length?  Options
A) 13.9 sec  B) 12.3 sec  C) 17.9 sec  D) 61.9 sec  E) 47.98 sec

Rationale: "speed = 80 * 5 / 18 = 22 m / sec total distance covered = 130 + 140 = 270 m . required time = 270 / 22 = 12.3 sec . answer : b"
Answer: B