A train running at the speed of 27 km/hr crosses a post in 20 seconds. What is the length of the train?
Answers.
A) 200	B) 150	C) 300	D) 175	E) 250

Rationale: "speed = ( 27 x 5 / 18 ) = 7.5 m / sec . length of the train = ( speed x time ) . length of the train = 7.5 x 20 m = 150 m . answer : b"
Answer: B