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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 :

two pipes P and Q are inlet pipes . If they are opened at alternate minutes and if pipe P is opened first, then in how many minutes will the tank be full ?

A

18 minutes

B

20 minutes

C

16 minutes

D

30 minutes

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