15.10 boys can dig a pitch in 12 hours.How long will 8 boys take to do in?

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

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

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?

A can do a piece of work in 4 hours, B and C together in 3 hours, and A and C together in 2 hours. How long will B alone take to do it? 8 hou r s b. 10 hou r s c. 12 hou r s d. 24 hou r s

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?

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?