A farmer can plough a farm in 10 days by working 5 h a day. In how many days can 5 farmers plough 10 such farms working at 5h a day?

If 4 men can reap a field in 5 days working 12 hours a day, in how many days can 10 men reap the same field working 8 hours a day?

If 10 men can complete a piece of work in 12 days by working 7 hours a day, then in how many days can 14 mendo the same work by working 6 hours a day?

10 men can make 20 toys in 12 days working 12h a day . Then in how many days can 24 persons make 32 toys working 16h a day ?

A can do of a work in 10 days. B can do of the work in 20 days. In how many days can both A and B together do the work?

If 10 men can complete a work in 12 days . In how many days can 18 men complete the same work ?

5 men can prepare 150 toys in 5 days working 6 hours a day. In how many hours 10 boys can prepare 200 toys in 10 days, if a man works thrice as fast as a boy?