A train is 435 meter long is running at a speed of 45 km/hour. In what time will it pass a bridge of 140 meter length Choose the correct choice from the following answers
A) 20 seconds B) 30 seconds C) 46 seconds D) 50 seconds E) none of these

Rationale: "explanation : speed = 45 km / hr = 45 * ( 5 / 18 ) m / sec = 25 / 2 m / sec total distance = 435 + 140 = 575 meter time = distance / speed = 575 ∗ 2 / 25 = 46 seconds option c"
Answer: C