Question 297269
Add their rates of working to get their
rate working together
Tom's rate: (1 job)/(4 hrs)
Joy's rate: (1 job)/(3 hrs)
{{{1/4 + 1/3 = 1/x}}}
Multiply both sides by {{{12x}}}
{{{3x + 4x = 12}}}
{{{7x = 12}}}
{{{x = 12/7}}} hrs