A train running at the speed of 60 km/hr crosses a pole in 42 seconds. What is the length of the train?  Choose the correct choice from the following.
A) 120 metres
B) 700 metres
C) 324 metres
D) 828 metres
E) 600 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 / 3 x 42 m = 150 m . option b"
Answer: B