Give a quick stream of consciousness before answering the following question. Ravi can do a piece of work in 25 days while Prakash can do it in 35 days. In how many days will they finish it together?
Options:
(A) 15 7/9 days
(B) 16 17/9 days
(C) 15 1/19 days
(D) 14 7/12 days
(E) 14 7/9 days
1/25 + 1/35 = 12/175
175/12 = 14 7/12 days
The answer: (D).