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To find the speed of the copy machine, we need to divide the number of pages copied by the time it took to copy them. In this case, the copy machine made a copy of Leslie's 3-page essay in just 1/10 of a minute.
So, the speed of the copy machine is 3 pages / 1/10 minute = 3 pages * 10/1 minute = 3 pages * 10 = 30 pages per minute (or 30/1 pages per minute).
The speed of the copy machine is 30 pages per minute.