Question 870960
Add their rates of working to get their rate
working together
Jane's rate:
( 1 lawn ) / ( 50 min )
Mike's rate:
( 1 lawn ) / ( t min )
Rate working together:
( 1 lawn ) / ( 30 min )
-------------------
{{{ 1/50 + 1/t = 1/30 }}}
Multiply both sides by {{{ 150t }}}
{{{ 3t + 150 = 5t }}}
{{{ 2t = 150 }}}
{{{ t = 75 }}}
{{{ 75 - 60 = 15 }}}
It takes Mike 1 hr 15 min working alone