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?

2 Answers on this Question

1. (1/30)+(1/40)=7/120
   =>120/7=17.14 days
   In 17.14 days, both can together finish the work

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2. Ravi do a work in 30 days
   Prakash do a work in 40days
   then both work together 1/30+1/40=70/1200
   then solve values 120/7 is 17(1/7) days

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