Ravi can do a piece of work in 26 days while Prakash can do it in 40 days. In how many days will they finish it together?	Options:  A) 15 25/33 days  B) 16 1/33 days  C) 17 1/33 days  D) 17 25/33 days  E) 18 1/33 days
1/26 + 1/40 = 33/520   520/33   = 15 25/33 days   15 25/33 daysnswer: 15 25/33 days
<result>A</result>
Ravi can do a piece of work in 26 days while Prakash can do it in 40 days. In how many days will they finish it together?