A train 250 m long, running with a speed of 50 km/hr will pass a tree in?	Choose the correct choice from the following answers:
A) 18 sec B) 20 sec C) 25 sec D) 30 sec E) 1 min

Rationale: "speed = 50 * 5 / 18 = 125 / 9 m / sec time taken = 250 * 9 / 125 = 18 sec answer : a"
Answer: A