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A can copy 75 pages in 25 hours. A and B...

A can copy 75 pages in 25 hours. A and B together can copy 135 pages in 27 hours. In what time can B copy 42 pages?

A

21 hours

B

5 hours, 36 seconds

C

18 hours

D

24 hours

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The correct Answer is:
A
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