A train is 360 meter long is running at a speed of 36 km/hour. In what time will it pass a bridge of 140 meter length?	Choose the correct choice:
A) 50 seconds B) 29 seconds C) 40 seconds D) 11 seconds E) 12 seconds

Rationale: "speed = 36 km / hr = 36 * ( 5 / 18 ) m / sec = 10 m / sec total distance = 360 + 140 = 500 meter time = distance / speed = 500 * ( 1 / 10 ) = 50 seconds answer : a"
Answer: A