Question

The temperature at 12 noon was 18 degree above zero. If it decreases at the rate 3degree per hour at what time it would be 12 below zero

Answer 1

Answer:

10 pm

Explanation:

given temperature at 12 noon= +18 degree

reduce in temp. =3 degree/hour

let at x time the temp will be -12 degree

Total decrease in temperature = 18+12

=30degree

therefore

3x=30(because it decreases 3 degree per hour)

x=30/3

x=10

therefore it will take 10 hours to decrease temperature about -12 degree

so from 12 noon it took 10 hours

so at 10pm the temperature will be -12degree