One train is travelling 45 kmph and other is at 10 meters a second. Ratio of the speed of the two trains is? Pick one
A) 3 : 3	B) 5 : 7	C) 5 : 4	D) 7 : 2	E) 8 : 5

Rationale: c 5 : 4 45 * 5 / 18 = 10 25 : 20 = > 5 : 4
Answer: C