Task: Question Answering
Input (English): Problem: two trains 500 m and 750 m long run at the speed of 60 km / hr and 40 km / hr respectively in opposite directions on parallel tracks . the time which they take to cross each other is ? 
Options: a ) 10.6 , b ) 45 , c ) 10.4 , d ) 10.8 , e ) 10.1
Output (English): b