Question

7) The temperature at 10a.m. was 12°C above zero. If it decreases at the rate of 3°C per hour until midnight, at
what time would temperature be 15°C below zero? What would be the temperature at midnight?
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Answer 1

Please try to answer the questions by own...

Answer 2

Answer:

Solution : Temperature at 12 Noon = 10°C above 0°C = 10°C

             It decreases at 2° per hour.

Final temperature = 8°C below 0 = -8°C

Change in temperature = 10 - ( -8 ) = 18°C.

Rate of decrease = 2° per hour.

Time = 18 / 2 = 9 hours.

So, Time at which temperature would be 8°C below zero = 12:00 + 9:00 = 21:00

                 So, the time at which temperature goes 8°C below 0 is 9:00 PM.

Also, The temperature at 12 :00 PM = 10° C, As temperature decreases at 2°C,

Temperature at mid night = 10° C - 2 ( 12 ) = 10 - 24 = -14° C.

Hope helped!