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) 17 1/5	C) 17 1/8	D) 17 1/1	E) 17 1/2
1/30 + 1/40 = 7/120   120/7 = 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?