The temperature at noon at a certain level was 12 degrees above zero. If it decreases at the rate of 2 degrees per hour until midnight ,at what time would it be 10 degrees below zero?
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The temperature decreases at a rate of 2degrees per hour
It was actually 12 degree above zero
We need to find at what time does the the temperature drops down to 10 degree below zero that is -10
Temperature change = 12-(-10)
=12+10
=22
For one hour it drops by 2degree
So it takes 22/2=11hours to attain -10 degree
It means, at 11'o clock e temperature falls down to -10 degree
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