Question 31092
1 1/2 hours --> 3/2
Equation:
let the second worker's time be x
1/3+1/x=1/3/2 ----> {{{1/3+1/x=2/3}}}
Multiply the whole equation by 6 to remove the fraction:
{{{6(1/3)+6(1/x)=6(2/3)}}}
{{{2+6/x=2(2)}}}
{{{2+6/x=4}}}
{{{2x+6=4x}}}
2x=6
x=3


<font color = brown>Hence, it takes the second custodian about 3 hours to do the job alone.</font>
Paul.