Rishi has set up hydroponics on his terrace. He has connected the water bed to four water inlets A , B , C , D . The problem is that water flow from all these inlets is not the same. If A and D inlets are used, the water bed fills up in 20 minutes. If B, C, and D are used, the water bed fills up in 15 minutes. If A, B, and C are used, it takes 12 minutes to fill up the system. If Rishi was in a rush, what is the fastest time i n m i n u t e s in which the water bed could be filled up?
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i am give all answer is correct and this question answer is 9
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