Question 167349
Add their rates of working to get
the rate working together
(1 house)/(8 hrs) + (1 house)/(12 hrs) = (1 house)/(x hrs)
{{{1/8 + 1/12 = 1/x}}}
Multiply both sides by {{{24x}}}
{{{3x + 2x = 24}}}
{{{5x = 24}}}
{{{x = 4.8}}}
Working together, it will take them 4.8 hrs, or 4 hrs 48 min