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In the afternoon, the decibel level of a
busy freeway is 100 dB with 100 cars
passing a given point every minute.
Late at night, the traffic flow is only
20 cars per minute. What is the late -
night decibel level? a. 20 dB b. 50
dB c. 80 dB d. 88 dB e. 93 dB

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