Question 188377
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For Ted's job: 1 Wall/ 20 minutes


For Burt's job:  1 Wall / 30 minutes


Together Ted & Burt: 1 Wall / <font color=red>x</font> minutes


Let's put that into Eqn:
{{{1/20+1/30=1/x}}}
{{{(3+2)/60=1/x}}}
{{{(3+2)x=60*1}}}
{{{5x=60}}} -----> {{{cross(5)x/cross(5)=cross(60)12/cross(5)}}}
<font color=red>x=12 minutes</font> Answer (working together)


Thank you,
Jojo</font>