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Study the following graph and answer the...

Study the following graph and answer the given question .
The graph shows the time (in minutes) taken by the pipes (A,B), (C,D), (E,F), (G,H) and (P,Q) to fill a tank :

In how many minutes is an empty tank filled completely if pipe D fills it for half the time and then for the other half time, pipes C and D fill it together ?

A

15 minutes

B

18 minutes

C

12 minutes

D

10 minutes

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