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A and B are two taps which can fill a ta...

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 ?

A

2 minutes

B

4 minutes

C

5 minutes

D

8 minutes

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