8 Men Complete Work In 6 Hours

8 men complete a work in 6 hours. In how many hours will 12 men complete the same work ?

8 men can complete a work in = 6 hours
1 man can complete the work in = 6×8 hours
12 men can complete the work in = $\frac { 6 x 8 }{ 12 }$ = 4 hours