Subject: mathqa
Question: 2 trains starting at the same time from 2 stations 200 km apart and going in opposite direction cross each other at a distance of 110 km from one of the stations . what is the ratio of their speeds ?
Option: 
A: 11 : 9
B: 11 : 1
C: 11 : 2
D: 11 : 5
Answer: A