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A Common Mistake! AB2 Alice and Bob can complete a job in 2 hours. A C3 Alice and Charlie can complete the same job in 3 hours. B C4 Bob and Charlie can complete the same job in 4 hours. 2(A B C) 9 A B C 92 4.5 They take 4.5 hours working together. Mind Your Decisions pac1261 1 year ago p 16 4.9K REPLY But this makes no sense! When three people work together, it should take less time than when only two people work. But 4.5 hours is more time. So this answer must be wrong; the equations were set up incorrectly. 1 work in software development, and everyone in that field knows that the more programmers you assign to a task, the longer it will take.