Question 976597
Let r be rate for one man, and let t be the unknown time in the second part of the description, the time quantity asked for.


The second part uses a combination of 25 men and 22 men.


{{{system(25r*32=1,25r*10+22r*t=1)}}}
This is the system for the whole description in the form of equations.  Use the first equation to get a value for r, and use this to solve for t in the second equation.


{{{r=1/(25*32)}}}
;
{{{22rt=1-25r*10}}}
{{{t=(1-250r)/22r}}}
{{{t=1/(22r)-250/22}}}
{{{t=1/(22(1/(25*32)))-250/22}}}
{{{t=1/(22/(25*32))-250/22}}}
{{{t=25*32/22-250/22}}}
{{{t=(25*32-250)/22}}}
{{{t=550/22}}}
{{{t=(5*11*10)/(11*2)}}}
{{{highlight(t=25)}}}