Task: Question Answering
Input (English): Problem: a can do a piece of work in 4 hours . a and c together can do it in just 2 hours , while b and c together need 3 hours to finish the same work . b alone can complete the work in - - - hours . 
Options: a ) 65 , b ) 85 , c ) 48 , d ) 12 , e ) 25
Output (English): d