Question 1159580
in 1 minutes printer a can do (1/12) of the project and in x minutes (x/12). Similarly, b can do (x/30)
Together, they do 1 fun project  or (x/12)+(x/30)=1
multiply  through by 60
5x+2x=60
x=60/7 minutes or 8.57 minutes.  A does 71.4% and B does 28.6%