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Two taps A and B can fill a tank in 24 and 30 minutes respectively. Both are opened together. But at the end of 8 minutes, the first is turned off, the time taken to fill the tank will be
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Explanation:
After 8 minutes, part of the tank filled
8(1\24+1\30)=8[5+4\120]=3\5
Therefore, Balance tank to be filled by B alone = 2\5
∴1\2\5=B×30\B×?
∴?=2\5×30=12minutes