Question 604102
John's rate of typing is {{{ 1/5 }}} papers/hours
Their rate together is {{{ 1/2 }}} papers/hours
Let {{{ t }}} = Jim's time to type 1 paper
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{{{ 1/5 + 1/t = 1/2 }}}
Multiply both sides by {{{ 10t }}}
{{{ 2t + 10 = 5t }}}
{{{ 3t = 10 }}}
{{{ t = 10/3 }}} hrs
{{{ t = 3 + 1/3 }}} hrs
{{{ (1/3)*60 = 20 }}} min
Jim takes 3 hrs and 20 min to type the paper