Pipe A alone takes 30 minutes to fill a cistern. Pipe A was turned off after working for 10 minutes. The rest of the cistern is filled by pipe B in 40 minutes. How much time in minutes does pipe B take to fill the cistern alone in hours?

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Pipe A alone takes 30 minutes to fill a cistern. Pipe A was turned off after working for 10 minutes. The rest of the cistern is filled by pipe B in 40 minutes. How much time in minutes does pipe B take to fill the cistern alone in hours?