A printing press has two machines. One prints 600 pages/hour, the other 400. How long to print 10,000 pages if both work together?
Correct answer: B. 10
- A. 8
- B. 10
- C. 12
- D. 15
Explanation
To solve this problem, calculate the combined work rate of both machines. Machine 1 prints 600 pages/hour, and Machine 2 prints 400 pages/hour. Together, they print 600 + 400 = 1000 pages/hour. To determine the time required to print 10,000 pages, divide the total number of pages by the combined rate: 10,000 pages / 1000 pages/hour = 10 hours. Therefore, the correct answer is 10 hours. The other options are incorrect because they either underestimate or overestimate the combined printing rate, leading to incorrect time estimates.
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