the temperature at 12 noon was 10°c above zero. if it decrease at the rate of 2°c per hour until midnight, at what time would the temperature be 8°c below zero? what would be the temperature at mid-night .
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Change in temperature = 10 - ( -8 ) = 18°C. Rate of decrease = 2° per hour. Time = 18 / 2 = 9 hours. So, the time at which temperature goes 8°C below 0 is 9:00 PM.
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