the temperature of 12 noon was 10degree Celsious above zero if 8 Decreases at the rate of 2 degree Celsius per hour until midnight at what time would the temperature by 8 degree below zero
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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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