Compare the rates of two trains, one travelling at 90 km/hr and other is at 50m/s?
Select:	A) 2 : 1	B) 1 : 2	C) 1 : 3	D) 3 : 1	E) 2 : 3

Rationale: speed of the 1 st train = 90 km / hr speed of the 2 nd train = 50 m / s = 50 * 18 / 5 = 180 km / hr ratio of the speeds of the train = 90 : 180 = 1 : 2 answer is b
Answer: B