Question

The initial temperature of a substance is 5oC. It is decreasing by 1oC in every 5 minutes. (a) What will its temperature after 25 minutes?
(b) How long will it take to achieve (-15oC)?

Answer 1

Answer:

1. After 25 minutes 0 degree celcius  2. 20 minutes for -15 degree celcius

Step-by-step explanation:

1.) First temperature 5 degree celcius

for 1 degree celcius dropping it takes 5 minutes

So 5 x 5 = 25 and 5-5 = 0 degree celcius

2.) For 0 degree celcius it takes 25 minutes

So for -15 degree celcius it takes

1 degree = 5 min

-15 degree = ?

-15 x 5 / 1 = - 75 minutes

Please make my answer the brainliest