Task: Question Answering
Input (English): Problem: two trains of length 220 m and 280 m are running towards each other on parallel lines at 42 kmph and 30 kmph respectively . in what time will they be clear of each other from the moment they meet ? 
Options: a ) 28 , b ) 266 , c ) 990 , d ) 25 , e ) 11
Output (English): d