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?
Select:
A) 17 1/7	B) 2/7	C) 8/5	D) 4/9	E) 3/8
Explanation:   1/30 + 1/40 = 7/120   120/7 = 17 1/7 days   So, both together will finish the work in 17 1/ 7 days.   17 1/7nswer:17 1/7
<result>A</result>
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?