The temperature at 12 noon was 10∘C above zero. If it decreases at the rate of 2 ∘C per hour until midnight, what would be the temperature at 9 p.m.?
A
-8∘C
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B
-6∘C
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C
8∘C
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D
6∘C
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Solution
The correct option is A -8∘C Given the temperature at 12 noon is 10∘C.
The temperature decreases at the rate of 2∘C per hour until midnight.
From 12 noon to 9 p.m, it is 9 hours. ⇒ Temperature decrease =9×(−2∘C)=−18∘C ∴ Temperature at 9 p.m =10∘C+(−18∘C) =−8∘C