Question

the temperature at 12 noon was 10 degree Celsius above zero if it decreases at the rate of 2 degree Celsius per hour until midnight at what time would the temperature 8degree Celsius below zero what would be the temperature at midnight​

Answer 1

Answer:

9pm & -14°

Step-by-step explanation:

temp @ 12:00N : +10°

decrease per hr : - 2°

duration until 12:00 Midnight : 12 hrs

temp decreases for 12hrs =12 × -2 = -24°

temp @midnight = temp@ 12:00N + total decrease

= +10° + (-24°) = -14°

***********

now....temp = -8°

means...temp@ 12:00N + decrease = -8°

i,e...+10° + decrease = -8°

decrease = -8° - 10° = -18°

but rate = -2°

and 9 × -2 = -18

it takes 9 hrs to drop to -8°

time @-8° = 12:00N + 9hrs = 9:00pm