Question 1148960
r, rate for 1 person
5r, rate for 5 people
ONE wall,  {{{5r*1=1}}}
{{{5r=1}}}

{{{r=1/5}}}



Eight People, same one wall;  how much time?
x, time


{{{8rx=1}}}

{{{8(1/5)x=1}}}

{{{highlight(x=5/8)}}}{{{hour}}}

About 38 minutes