A tank can be filled by two taps 'A' and 'B' in 12 hours and 10 hours respectively. The full tank can be emptied by a third tap 'C' in 20 hours. If all the taps are turned on at the same time in how much time will the empty tank be filled up completely?
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Answer:
2 hrs
Step-by-step explanation:
i dont know if its true but 12 + 10 = 22 and 22-20 = 2
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