A train is 300 meter long is running at a speed of 54 km/hour. In what time will it pass a tunnel of 1200 meter length?	Pick one
A) 90 seconds
B) 85 seconds
C) 40 seconds
D) 100 seconds
E) 120 seconds

Rationale: speed = 54 km / hr = 54 * ( 5 / 18 ) m / sec = 15 m / sec total distance = 300 + 1200 = 1500 meter time = distance / speed = 1500 * ( 15 ) = 100 seconds answer : d
Answer: D