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A cistern has a leak which would empty it in 15 hours. A tap is turned on which admits 2 litres per hour into the cistern and it is now emptied in 10 hours. How many litres does the cistern hold?

50 litres
60 litres
45 litres
360 litres

Correct Answer: 60 litres

Explanation:

Here w = 2 litres per hour
∴ Required answer = {(15 x 10) / (15 - 10)} x 2 = 60 litres.

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