Task: Question Answering
Input (English): Question: Two Trains starting at same time from two stations 320km apart and going in opposite directions cross each other at a distance of 140km from first stations. What is the ratio of their speeds

 Option A: 6:7

 Option B: 4:7

 Option C: 7:9

 Option D: 7:11

 Option E: 7:12
Output (English): Option C