Question

A certain freezing process requires that room temperature be lowered from 30°C at the rate of 5°C every hour. What will be the room temperature 5 hours after the process begins?​

Answer 1

Answer:

5°C

Step-by-step explanation:

it's because unitary method is used

let the temprature be x°

so, it's decreasing 5° and hour

therefore temp after 5 hours = 30-5×5=5

Answer 2

Answer:

Given that

Let us assume that the lowered temperature as negative,

Initial temperature = 40oC

Change in temperature per hour = -5oC

Change in temperature after 10 hours = (-5) × 10 = -50oC

∴The final room temperature after 10 hours of freezing process = 40oC + (-50oC)

= -10oC

The room temperature 10 hours after the process begins= -10oC