One train is travelling 45 kmph and other is at 10 meters a second. Ratio of the speed of the two trains is?  Choose the correct answer:
A) 3:3
B) 5:7
C) 5:4
D) 7:2
E) 8:5
5:4   5:4   45 * 5/18 = 10   25:20 =&gt; 5:4
<result>C</result>
One train is travelling 45 kmph and other is at 10 meters a second. Ratio of the speed of the two trains is?