Task: Question Answering
Input (English): Problem: a alone can do a piece of work in 6 days and b alone in 8 days. a and b undertook to do it for rs. 6000. with the help of c, they completed the work in 3 days. how much is to be paid to c ?
Options: a. s. 375, b. s. 400, c. s. 600, d. s. 750, e. s. 850
Output (English): d