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Question

A leak in the bottom of a tank can empty the full tank in 8 hour. An inlet pipe fills water at the rate of 6 liters a minutes. When the tank is full the inlet is opened and due to leak the tank is empty in 12 hours. How many liters does the cistern hold ?

A
7580
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B
7960
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C
8290
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D
8640
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Solution

The correct option is D 8640
Work done by inlet in one hour =18112
Then, work done by inlet in one minute =18×160=11440
Given volume =11440=6 liters
Or whole volume=6×1440=8640 liters

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