Question 387576
Let x=amount of time it takes both machines working together to produce 6600 cans
Then both machines working together works at the rate of 6600/x cans per min
The newer machine works at the rate of 6600/220 = 30 cans per min
The older machine works at the rate of 6600/330=20 cans per min
Then both machines work at the rate of 30+20=50 cans per min
Soooooo, our equation to solve is:
50=6600/x
50x=6600
x=132 min ----time it takes both machines working together to produce 6600 cans

CK
In 132 min, the newer machine produces 30*132=3960 cans
In 132 min the older machine produces 20*132=2640 cans
3960+2640=6600
6600=6600

Hope this helps---ptaylor