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UPSC 2015 CDS II Math Paper

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Question : 17

Total: 100

A and B are two taps which can fill a tank individually in 10 minutes and 20 minutes respectively. However, there is a leakage at the bottom, which can empty a filled tank in 40 minutes. If the tank is empty initially, how much time will both the taps take to fill the tank with leakage ?

2 minutes
4 minutes
5 minutes
8 minutes

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