ExplanationTry plugging in a number for s that divides easily by 60, such as 7,200. So, if s = 7,200 seconds, that’s 120 minutes or 2 hours. Plug in a nice number for r such as 5.
So, if the copier makes 5 pages per hour for 2 hours, your target is 10 pages.
Plug s = 7,200 and r = 5 into the answers. Ballpark: Choice (A) is too large, choice (B) too small, choice (C) too small, and choice (E) far too large. Only choice (D) yields your target of 10.
Hence option D is correct!
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