Question 863994
All three together, {{{1/80}}} rooms per minute
Keeping in minutes,
Continue at Kevin, {{{1/x}}} rooms per minute
Nick, {{{1/(x/2)=2/x}}}
Joe, {{{1/(x/2+60)=1/(x/2+120/2)=1/((x+120)/2)=2/(x+120)}}}
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See that x is assigned to how many minutes Kevin can do the job by himself.
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Summarizing the list of variable and nonvariable rates for easier reading:
All three together___________{{{1/80}}} rooms per minute
Kevin______________________{{{1/x}}}
Nick_______________________{{{2/x}}}
Joe______________________{{{2/(x+20)}}}