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