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Two taps X and Y are fixed to a water ta...

Two taps X and Y are fixed to a water tank. If only X is opened, it drains out the full tank of water in 20 minutes. If both X and Y are opened, then they drain out the full tank of water in 15 minutes. If only Y is opened, how long does it take to drain out the full tank of water?

A

30 minutes

B

45 minutes

C

60 minutes

D

90 minutes

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