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?
Choose the correct choice from the following options: A) 17 1/7 days B) 27 1/7 days C) 23 2/7 days D) 16 4/11 days E) none of these
1/30 + 1/40 = 7/120   120/7 = 17 1/7 days   17 1/7 daysNSWER:17 1/7 days
<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?