A Ship going at the speed of 18 km/hr crosses a light house in 20 seconds. What is the length of the train? Options:
A) 120	B) 150	C) 100	D) 240	E) 200

Rationale: speed = ( 18 x 5 / 18 ) = 5 m / sec . length of the train = ( speed x time ) . length of the train = 5 x 20 m = 100 m . answer : c
Answer: C