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