Question

PLEASE HELP IM HAVING A HARD TIME!!!

In a local city, the temperature at noon is -3 degrees Celsius. The temperature is expected to decrease 2.5 degrees Celsius by each hour until the temperature reaches -18 degrees Celsius.
How many hours will it take for the temperature to reach ?
A. 6 hours
B. 7 hours
C. 7.2 hours
D. 8.4 hours

Answer 1

2.5*6=15
(-3)-15= -18

Answer 2

Answer: Option 'A' is correct.

Explanation:

Since we have given that

At noon, the temperature was = -3 degrees

Temperature reduced by = 2.5 hours per day

Temperature reaches = -18 degrees

Let the number of hours be 'x'.

According to question,

`-3-2.5x=-18\\\\-2.5x=-18+3\\\\-2.5x=-15\\\\x=(15)/(2.5)=6`

Hence, it will take 6 hours for the temperature to reach.

Option 'A' is correct.