Question 30640
1 1/2 = 3/2 =1.5 = 90minutes
Equation:
*[tex \frac{x}{30}+\frac{x}{45}+\frac{x}{90}]
Common denomenator = 90
{{{3x/90+2x/90+1x/90}}}
{{{6x/90}}}
6x=90
x=15


<font color = red>Hence, it would take them 15 minutes to do the job together.</font>
Paul.