2 trains starting at the same time from 2 stations 200km apart and going in oppo

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2 trains starting at the same time from 2 stations 200km apart and going in opposite direction cross each other at a distance of 110km from one of the stations. What is the ratio of their speeds?

A. 11 : 9
B. 7 : 3
C. 18 : 4
D. none of these

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