Question

A certain freezing process requires that room temperature be lowered from 40°C at
the rate of 5°C every hour. What will be the room temperature 10 hours after the
process begins ?​

Answer 1

The present room temperature =
40
°
C
40°C

The room temperature decreasing every hour by rate of =
5
°
C
5°C

The room temperature after 10 hours will be

=
40
°
C

+

10
×
(
−
5
°
C
)
40°C + 10×(−5°C)

=
40
°
C
−
50
°
C

40°C−50°C

=
−
10
°
C
−10°C

so, the room temperature after 10 hour =
−
10
°
C
−10°C