Question 1015101
Let r be the slow man rate and then 2r is the fast man rate.


You have one slow man and two fast men, and combined, this group rate is  {{{r+2r+2r=5r}}}.


The group of men can do 1 job in 12 days;
{{{(5r)*12=1}}}.


{{{r=1/(5*12)}}}


{{{r=1/60}}}, meaning the slow man does 1 job in 60 days.


Either of the FASTER men will simply need HALF those number of days for the 1 job, meaning  30 days.