Alocal dairy has three machines to fill half-gallon milk cartons. the machines can fill in the dialy quota in 6 hours, 7 hours, and 5.25 hours, respectively. find how long it takes to fill the daily quota if all three machines are running. it takes _ hours to fill the daily quota if all three machines are running. show me how to do this, and i will give a medal. i think the beginning equation is: 1/6+1/7+1/5.25=1/x. my answer is 0.50 hours, nut i just want to be sure. you!