Question 1124934

A new machine makes 20,000 aluminum cans three times faster than an older machine. With both machines operating, it takes 6 h to make 20,000 cans. How long would it take the new machine, working alone, to make 20,000 cans?
<pre>It's 1 job and that 1 job is making 20,000 cans
Let time newer machine takes be N
Then we get the following equation: {{{matrix(1,3, 1/N + 1/(3N), "=", 1/6)}}}      OR        {{{matrix(1,3, 6 * (1/N) + 6 * (1/(3N)), "=", 1)}}}
Solve any of the above and you should get a value of 8 for N, the time the new machine takes to do the ONE (1) job, alone!