1.  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 ?
A. 9 : 20
B. 11 : 9
C. 11 : 20
D. None of these

Answer: Option B

Explanation:

In the same time, they cover 110 km and 90 km respectively.

∴ Ratio of their speeds = 110 : 90 = 11 : 9