Ravi can do a piece of work in 20 days while Prakash can do it in 40 days. In how many days will they finish it together?  Choose the correct option: A) 5 7/9 days B) 6 7/9 days C) 5 1/9 days D) 5 7/2 days E) 4 7/9 days
1/20 + 1/40 = 3/40   40/7 = 5 7/9 days   5 7/9 daysNSWER:5 7/9 days
<result>A</result>
Ravi can do a piece of work in 20 days while Prakash can do it in 40 days. In how many days will they finish it together?