Question

the answer should be 9PM;temperature at midnight

Answer 1

the temperature will be 8°c below 0 at 9 p.m.
and at midnight it will be -14°c
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Answer 2

Hey there! ☺☻☺

$\text{Temp. at 12 noon} = 12^o \ C \\\text{Another Temp.} = -8^o \ C\\\text{Rate of temp. decreases at }2^o \ C\text{ per hour} \\\\Now,\\\text{Difference in temp.} = 10 - (-8) = 18^o \ C\\Time =\frac{18}{2} = 9 \ hour \\\\Then,\\\text{Temp. at midnight} = -8^o + (-2^o \times 3)\\~~~~~~~~~~~~~~~~~~~~~~~~~~=-14^o \ C\\\\Hence, \text{Time when temp. }8^o \ C \text{ below zero} = \boxed{\boxed{\bold{9 \ PM}}}\\\text{Temp. in midnight } = \boxed{\boxed{\bold{-14^o \ C}}}$

Hope It Helps You! ☺☻☺