It would take one machine twenty-five minutes to make five widgets, therefore a machine can produce a single widget in five minutes.
So it takes one machine five hundred minutes to produce a hundred widgets. But if that burden is shared among one hundred machines then it takes only five minutes.
Which is a tedious way of pointing out what you can intuitively grasp, that if x machines can produce x widgets in five minutes then the minutes required for production will be constant for any value of x.