| The teacher gave the following puzzle to her students to solve. |
| 'A container holds the equivalent of 30 glasses of water. If the tap on it is turned, it takes ten seconds to fill a glass of water. How long will the container take to be emptied if the tap is kept open'? |
| Four different answer came from the students. They were |
A) four minutes
B) five minutes
C) Less than four minutes
D) More than five minutes
Correct Answer: A
Solution :
A plain mathematical calculation gives us the answer-minutes. But, with the decrease in the height of column water in the container, the pressure on the bottom of container will decrease. Hence, more than five minutes will be required for the container to be emptied.
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