Question 1118293
x, the time for just the assistant alone


{{{1/60+1/x=1/50}}}

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{{{300x(1/60+1/x)=300x(1/50)}}}

{{{5x+300=6x}}}

{{{highlight(x=300)}}}------minutes.  (five hours)

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check
{{{1/60+1/300=1/50}}}

{{{(5/5)(1/60)+1/300}}}

{{{5/300+1/300}}}

{{{6/300}}}

{{{(2*3)/(3*100)}}}

{{{2/100=1/50}}} {{{okay}}}