A, B and C are attached to a tank. A and B can fill it in 20 and 30 minutes respectively while C can empty it in 15 minutes. If A, B and C are kept open successively for 1 minute each how soon will the tank be filled?
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Answer:
half tank of each
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because they are get together
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Answer: click on the attachment
Please select my answer as BRAINLIST
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