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The time taken by Operator A to finish a task has a normal distribution with a mean 220 minutes and standard deviation 11 minutes. The time taken by Operator B to finish a task has a normal distribution with a mean 185 minutes and standard deviation 9 minutes, independent of Operator A. Operator A began working at 9 AM. The probability that Operator A finishes before Operator B is 0.90. What time did operator B start working?

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