Task: Question Answering
Input (English): Problem: a can do a work in 15 days b in 14 days and c in 16 days . if they work on it together then in how many days required to complete the work ? 
Options: a ) 3360 / 210 , b ) 3360 / 21 , c ) 3360 / 674 , d ) 3360 / 240 , e ) 3360 / 224
Output (English): c