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The temperature of a metallic rod is 278 degrees c. If it is made to cool off at the rate of 7 degrees c every minute then what will be its temperature

after 20 minutes?


Rate of cooling = 7 degrees per minute.
its temperature decreased after 20 minutes= 20*7= 140 degree
its final temperature after 20 minutes= 278-140= 138 degree.
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