A bathtub can be filled by 2 inlet pipes in 10 minutes and 15 minutes respectively. A person leaves the tub after opening both the pipes simultaneously and returns at the moment when the tub is expected to get filled. He finds that the drainage pipe was also open so he now closes it. In 3 minutes more, the tub gets filled. What will be the time taken by the drainage pipe to empty a completely filled tub?
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