Task: Question Answering
Input (English): Problem: two stations a and b are 20 km apart on a straight line . one train starts from a at 7 a . m . and travels towards b at 20 kmph . another train starts from b at 8 a . m . and travels towards a at a speed of 25 kmph . at what time will they meet ? 
Options: a ) 9 , b ) 10 , c ) 11 , d ) 12 , e ) 8
Output (English): e