Task: Question Answering
Input (English): Problem: two bullet train s 140 m and 210 m long run at the speed of 60 km / hr and 40 km / hr respectively in opposite directions on parallel tracks. the time ( in seconds ) which they take to cross each other, is :
Options: a. 15.8 sec., b. 12.6 sec., c. 11.8 sec., d. 10.8 sec., e. 08.8 sec.
Output (English): b