Norb and Nat enter a barbershop simultaneously-Norb to get a shave and Nat a haircut. If the

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Norb and Nat enter a barbershop simultaneously-Norb to get a shave and Nat a haircut. If the amount of time it takes to receive a haircut (shave) is exponentially distributed with mean 20 (15) minutes, and if Norb and Nat are immediately served, what is the probability that Nat finishes before Norb?

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