A can write 75 pages in 25 hours. A and B together can write 135 pages in 27 hou

Question

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

Options:

A . 17 hrs

B . 19 hrs

C . 21 hrs

D . 23 hrs

Answer: Option C

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