Question

The temperature at 12 noon was 10°C above zero. If it decreases at the rate of 2°C per hour
until midnight.
(i) At what time would the temperature be −8°C?
(ii) What would be the temperature at mid-night?
(iii) At what time would the temperature be 0°C?

Answer 1

Answer:

(i) at 9:00 pm it would be -8 degrees

(ii) -14 degrees at midnight

(iii)at 5 pm it would be o degrees.

I hope it helped you.

Answer 2

i)9 PM

ii)-14°C

iii)5 PM

Step-by-step explanation:

ii)If the temperature at 12 noon was 10°C.

Then, the temperature at 12 midnight would be -14°C. As,Time difference is 12 hours and temperature decreases 2° per hour. We get that 2*12=24

Now, the current temperature = 10°C

Therefore,(10-24)°C= -14°C

i)If the temperature at 12 midnight was -14°C

The time at which the temperature was -8°C would be =>(14-8)=6

Now,6÷2=3

So,12 midnight - 3 hours =9 PM

iii)The temperature at 12 noon was 10°C

Therefore the time at which temperature was 0°C=> 10°C - 0°C= 10°C

Therefore, 10°C÷2=5

So,12 noon + 5 hours = 5 PM

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