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In one minute tap A fills 1/4 of the tank
In one minute tap B fills 1/3 of the tank
In one minute, the two taps fill 1/3 + 1/4 = 7/12 of the tank
To fill the whole tank they take
1 × 1 × 12/7 = 1/5/7 minutes
Dana05 answered the question on October 16, 2019 at 11:23
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