A high-definition movie lasting 1 hour and 45 minutes consumed 4.5 Gb of memory on the hard

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A high-definition movie lasting 1 hour and 45 minutes consumed 4.5 Gb of memory on the hard drive of a personal video recorder (PVR). Rounded to the nearest minute, what is the maximum duration of high-definition recording that could be saved on the PVR’s 80-Gb hard drive?
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