Two taps, A and B, can be used to fill a swimming pool. If tap A is fully open and tap B is closed, it takes 4 hours for the pool to be filled. If tap A is closed and tap B is fully open, it takes 3 hours for the pool to be filled. Suppose the pool was filled and the tap A was open for x hours. For how many hours was the tap B open? The tap B was open for 2.85

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