A, B, C, are pipes attached to certain. A and B can fill it in 20 and 30 minutes respectively. While C can be empty in 15 minutes. If A, B, C, be kept open successively for 1 minutes each, how soon will the cistern be filled?
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pip pip to in order to origin yours faithfully for and 36 leaves and 36 leaves the following is divisible write a dance I was just wondering what the meeting ID
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