A) \[-{{8}^{o}}C\]
B) \[-{{6}^{o}}C\]
C) \[{{8}^{o}}C\]
D) \[{{6}^{o}}C\]
Correct Answer: A
Solution :
Given the temperature at 12 noon is \[{{10}^{o}}C\] The temperature decreases at the rate of \[{{2}^{o}}C\] per hour until mid night. From 12 noon to 9 p.m. it is 9 hours. \[\Rightarrow \]Temperature decrease \[=9\times (-{{2}^{o}}C)=-{{18}^{o}}C\] \[\therefore \]Temperature at 9 p.m \[={{10}^{o}}C+(-{{18}^{o}}C)=-{{8}^{o}}C\]
You need to login to perform this action.
You will be redirected in
3 sec
