How long does a train 130 m long running at the speed of 65 km/hr takes to cross a bridge 150 m length?
Choices:  A) 15.7 sec  B) 15.1 sec  C) 15.5 sec  D) 17.1 sec  E) 16.7 sec

Rationale: "speed = 65 * 5 / 18 = 18.1 m / sec total distance covered = 130 + 150 = 280 m . required time = 280 / 18.1 ' = 15.5 sec . answer : c"
Answer: C