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A construction worker must operate a jackhammer, which generate 105dBA of noise, and drive a construction vehicle, which generate 80dBA of noise, for cement paving. Every hour of jackhammer operation only needs half an hour of construction vehicle use. Without hearing protection, how much time should the worker operate the jackhammer and construction vehicle a day according to the OSHA 1983 standard. Be sure to show all work. Please specify the units as appropriate

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