A train is 700 meter long is running at a speed of 21 km/hour. In what time will it pass a bridge of 130 meter length?  Choose the correct choice from the following:  A) 142.286  B) 251.228  C) 34  D) 200  E) 150.627

Rationale: "speed = 21 km / hr = 21 * ( 5 / 18 ) m / sec = 35 / 6 m / sec total distance = 700 + 130 = 830 meter time = distance / speed = 830 * ( 6 / 35 ) = 142.286 seconds . answer : a"
Answer: A