T takes Franklin 14 hours to make a 200-square-foot cement patio. It takes Scott 10 hours to make the same size patio. Which equation can be used to find x, the number of hours it would take Franklin and Scott to make the patio together?

Franklin makes 1/14 patio per hour. Scott makes 1/10 patio per hour. Then:
1/14+1/10=1/x
5/70+7/70=1/x
12/70=1/x
x=70/12 hours, working together