Question 1020935
The job will take 5*48 = 240 people-minutes to complete.

==> {{{(1/(240 people-minutes))*(x minutes)*(12 people) = 1}}}

==> {{{(12x)/240 = 1}}}, or

{{{x/20 = 1}}} ==> x = 20 minutes.

Therefore it will take 20 minutes for 12 people to do the same job.