A speedboat has two engines, A and B. The joint density function of the lifetimes of the two engines, measured in hours, is: f(A, B) = .125 (A + B) defined on the square: 0 < x < 2 and 0 < y < 2. Calculate the probability that the speedboat fails during its first 84 minutes of operation, according to: The boat fails upon either engine failing: The boat fails only when both engines have failed:

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