Brian lives on a certain floor

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Question description

Brian lives on a certain floor of a high-rise building.  It takes him 30 seconds per floor to walk down the steps and 2 seconds per floor to ride the elevator.  If it takes Brian the same amount of time to walk down the steps to the first floor as it does to wait for the elevator for 7 minutes and ride down, on what floor of the high-rise does Brian live?

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(Top Tutor) Daniel C.
School: Carnegie Mellon University
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