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P, Q, R are 3 typists working simultaneously, can type 216 pages in 4 hrs. In one hour R can type as many pages more than Q as Q can type more than P. R can type as many pages in 5 Hrs as P in 7 Hrs. How many pages can they type in an hour seperately ?

A

15, 18, 21

B

6, 9, 15

C

18, 21, 24

D

9, 15, 18

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The correct Answer is:
A
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