Question 739502
Carol's rate:
( 1 job ) / ( 5 hrs )
Steve's rate:
( 1 job ) / ( 10 hrs )
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Add their rates of working to get rate
working together
{{{ 1/5 + 1/10 = 1/t }}}
Multiply both sides by {{{ 10t }}}
{{{ 2t + t = 10 }}}
{{{ 3t = 10 }}}
{{{ t = 10/3 }}} hrs
Convert to minutes
{{{ ( 10/3 )*60 = 200 }}} 
It will take them 200 min working together