Task: Question Answering
Input (English): Problem: two trains of length 100 meters and 200 meters are 450 meters apart . they are moving towards each other on parallel tracks , at speeds of 90 km / h and 72 km / h . after how many seconds will the trains meet ? 
Options: a ) 6 , b ) 8 , c ) 10 , d ) 12 , e ) 14
Output (English): c