Question

Question 7) A freezing system starts cooling the room at the rate of 4°C per hour. If at the beginning, the temperature of the room is 38° C, find the number of hours It takes to lower down the room temperature to -2°C.

Please give correct answer​

Answer 1

Answer:

9.5 hours exactly 9hours 30minutes

Answer 2

Answer:

10 hours

Step-by-step explanation:

Hi mate

here's your answer!

Rate of Cooling = 4°C per hour

Temperature of the room = 38°C

Therefore, no. of hours needed to lower the room temperature to -2°C =

(Remove the negative sign of -2°C and add 38°C and 2°C = 40°C)

Now, divide 40°C by 4 = 10 hours

Therefore , 10 hours will be required to lower down the room temperature to -2°C

Hope that helped!!