Question 530487
Add their rates of painting
Tyrone's rate: ( 1 kitchen )/(7 hrs)
Shauna's rate: ( 1 kitchen )/(6 hrs)
Rare together: ( 1 kitchen )/(t hrs)
{{{ 1/7 + 1/6 = 1/t }}}
Multiply both sides by {{{ 42t }}}
{{{ 6t + 7t = 42 }}}
{{{ 13t = 42 }}}
{{{ t = 42/13 }}} hrs