pencil with hot food cools from 94 degree Celsius to 86 degree Celsius in 2 minute when the room temperature is at 28 degree Celsius how long will it take to cool from 71 degree Celsius to 69 degree Celsius
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94-86=8 degree Celsius.
From the statement, 8 degree takes 2 minutes to Cool down.
71-69=2 degree Celsius.
As the Room temperature is 28 degree.
Then total temp. is 28+2=30 degree Celsius.
As 8 degree Celsius take 2 minutes.
Then, 8 degree = 2 minutes
Multiplying on both sides.
8 degree ×3 =2 min. ×3
24 degree = 6 minutes
As, 2 min. =8 degree
1 min. =4 degree
Then, 28 degree = (6+1=7) minutes
30 degree = 7 minutes nd 30 seconds. (7:30 minutes)
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