A train running at the speed of 54 km/hr crosses a pole in 7 seconds. Find the length of the train.  Options
A) 150 meter	B) 105 meter	C) 140 meter	D) 135 meter	E) none of these

Rationale: "explanation : speed = 54 * ( 5 / 18 ) m / sec = 15 m / sec length of train ( distance ) = speed * time = 15 * 7 = 105 meter option b"
Answer: B