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?	Choose one.
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   ANSWER:14 7/12 days
<result>D</result>
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?