Question 665479
Add their rates of painting
( 1 room painted / Sally's time ) + ( 1 room painted / Steve's time ) = 
( 1 room painted / time working together )
{{{ 1/6 + 1/3 = 1/t }}}
Multiply both sides by {{{ 6t }}}
{{{ t + 2t = 6 }}}
{{{ 3t = 6 }}}
{{{ t = 2 }}}
It will take them 2 hrs working together