Question

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

Answer:

Rate of decreasing temperature in 1 hour 2.C

Rate of decreasing in half hour 1.C

Now,

Total temperature 10.C+8.C

18.C

The time when the temperature be 8.C below zero 1/2 multiplied 18.C

9pm

Temperature at mid night -8.C-6.C

-14.C

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Answer 2

Answer:

12+15

=27 degree temperature fall

=at each hour 3°fall

so nine hours will be taken to reach temperature -15°

time will be 7.00pm

temp. at midnight is -15 -(3×5)

=-30

Step-by-step explanation: