An old printer prints 5 pages per minute. A new one is 60% faster. Together, how long to print 300 pages?
Correct answer: B. 23 min
- A. 15 min
- B. 23 min
- C. 18 min
- D. 20 min
Explanation
To determine the time taken by both printers together, first calculate the speed of the new printer. The old printer prints 5 pages per minute. With a 60% increase, the new printer prints at 8 pages per minute (5 + 0.6 * 5). Together, they print 13 pages per minute (5 + 8). To print 300 pages, they need 300 pages / 13 pages per minute ≈ 23.08 minutes. Rounding it yields 23 minutes, making this the correct answer. The other options assume incorrect combined speeds or miscalculate the time required.
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