Question

The temperature at 2 pm was 10°C above zero. If it decreases at the rate of 3°C per hour
until midnight at what time would the temperature be 9°C below zero?
What would be the temperature at mid-night?​

Answer 1

Answer:

it would go negative before 10 hrs of midnight

Answer 2

Answer:

8*C or below

Step-by-step explanation:

Every hour temperature decrease by 2\degree C2°C

Therefore the temperature decrease 2\degree C2°C = 1 hour

So the temperature decrease 1\degree C1°C = \frac{1}{2}\ hour  

2

1

​  

 hour

So the temperature at 18\degree C18°C = \frac{1}{2}\times18\ \ =\ 9\ hours\  

2

1

​  

×18  = 9 hours  

Total time = 12 hours + 9 hours

= 21 hours

= 9 pm

thus, at 9pm the temperature would be 8\degree C\ below\ 0\degree C8°C below 0°C