Question

In a local city, the temperature at noon is Negative 3 degrees Celsius. The temperature is expected to decrease by 2.5 degrees Celsius each hour until the temperature reaches Negative 18 degrees Celsius. How many hours will it take for the temperature to reach Negative 18 degrees Celsius?

Answer 1

6 hours

Explanation:

The temperature at noon is -3 °C.

Now, we are told it decreases by 2.5 °C hours each hours.

This means for x number of hours, the temperature would read;

-3 - 2.5x

Now, we want to find out how many hours before the scale reads -18°C

Thus;

-3 - 2.5x = -18

Rearranging, gives;

18 - 3 = 2.5x

15 = 2.5x

x = 15/2.5

x = 6