" 6."10" boys can dig a pitch in "12" hours.How long will "8" boys take to do it? "

Ravi can do a piece of work in 15 hours while Raman can do it in 12 hours. How long will both take to do it, woking together?

If 12 men and 16 boys can do a piece of work in 5 days and, 13 men and 24 boys can do it in 4 days, how long will 7 men and 10 boys take to do it ?

Tap A can fill a cistern in 8 hours and tap B can empty it in 12 hours.How long will it take to fill the cistern if both of them are opened together?

If 3 men or 6 boys can finish a work in 20 days, how long will 4 men and 12 boys take to finish the same work ?

12 men and 16 boys can do a piece of work in 5 days. 13 men and 24 boys can do the same work in 4 days. How long will 7 men and 10 boys take to do the same work?

A can do a piece of work in 7 days of 9 hours each and B can do it in 6 days of 7 hours each. How long will they take to do it,working a together 8(2)/(5) a day?

50 men can dig 40 holes in 30 days.How long will 25 men take to dig 20 holes?