Ravi can do a piece of work in 30 days while Prakash can do it in 40 days. In how many days will they finish it together?\nOptions:\n(A) 17 1/7 days\n(B) 17 1/8 days\n(C) 17 5/7 days\n(D) 17 3/7 days\n(E) 13 1/7 days Stream of consciousness:
User
1/30 + 1/40 = 7/120\n120/7 = 17 1/7 days
Thus, the answer is (A).
Assistant