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  • The temperature at 12 noon was 10 degree Celsius above zero. If it is decrease at a rate of 2 degree Celsius until midnight at what time will the temperature be 8 degree Celsius below zero. What will be the temperature at midnight?

The temperature at 12 noon was 10 degree Celsius above zero. If it is decrease at a rate of 2 degree Celsius until midnight at what time will the temperature be 8 degree Celsius below zero. What will be the temperature at midnight?

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eginarrayl extGiven,\ T_1=10^circ C at 12:00 pm\ extTemprature decrease 2 ^circ C per hr\ extIt is AP series - 10, 8, 6, 4, .........\ extWhen temprature will be -8^circ C.\ T_n=a+left(n-1 ight)d\ -8=10+left(n-1 ight)left(-2 ight)\ Rightarrow n=10 \ time =10+12 -1=21\ extSo, -8^circ C at 21:00 pm\ extAt midnight, \ 12:00 am , extafter 3:00 hr\ T=-8^circ C +left(-2^circ C imes3 ight)\ T=-14^circ Cendarray

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Deependra Verma

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