A train is 400 meter long is running at a speed of 60 km/hour. In what time will it pass a bridge of 800 meter length?
Pick: A) 72 seconds B) 27 seconds C) 40 seconds D) 128 seconds E) 18 seconds

Rationale: "speed = 60 km / hr = 60 * ( 5 / 18 ) m / sec = 150 / 9 m / sec total distance = 400 + 800 = 1200 meter time = distance / speed = 1200 * ( 9 / 150 ) = 72 seconds answer : a"
Answer: A