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Question

There is a bucket filled with boiling water. What should be done to cool down the water in the least amount of time?

A
Blowing air from the mouth
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B
Leaving it alone for some time
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C
Using a fan to blow cold air over it
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D
Blowing air over it with the help of a cardboard
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Solution

The correct option is C Using a fan to blow cold air over it
The fan will take the least amount of time to cool down the boiling water. Using the rest of the methods will take more time because the fan will blow cold air at a faster speed. Therefore, option C is correct.

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