A train running at the speed of 60 km/hr crosses a pole in 3 seconds. What is the length of the train?  Select the correct option:
A) 120 metres
B) 180 metres
C) 324 metres
D) 50 metres
E) 180 metres

Rationale: "speed = ( 60 x 5 / 18 ) / m / sec = 50 / 3 m / sec . length of the train = ( speed x time ) . length of the train = 50 x 3 / 3 m = 50 m . answer : option d"
Answer: D