Two trains starting at the same time from two stations 200 km apart and going in opposite directions cross each other at a distance of 110 km from one of the stations. What is the ratio of their speeds ?  Choose the correct choice from the following answers:
A) 11:9
B) 11:20
C) 9:20
D) 11:8
E) None
Sol.   In the same time, they cover 110 km and 90 km respectively.   ∴ Ratio of their speeds = 110 : 90 = 11 : 9.   11:9nswer 11:9
<result>A</result>
Two trains starting at the same time from two stations 200 km apart and going in opposite directions cross each other at a distance of 110 km from one of the stations. What is the ratio of their speeds ?