Question 919252
Uniform Rates for Job or Task,
RT=J, rate time job.




RATES:
Let x be the time for the slower person alone to do 1 job.
Fast Person, {{{1/(x-1)}}}
Slow Person, {{{1/x}}}
Combined Fast and Slow Persons, {{{1/(x-1)+1/x=1/4}}}


When you reach that far, you just need to solve for x, because you have the combined rate equation; the combined rate value is given in the problem description, so the sum of the rates of the two people are their combined rate working together.


Note, the question essentially asks for x-1; which you find after first solving for x.