A can do a work in 15 days and B in 10 days. They start together, but B leaves 2 days before the work is completed. In how many total days is the work finished?

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7.2. Let total time = t. Then t/15 + (t-2)/10 = 1. Multiplying by 30: 2t + 3(t-2) = 30, so 5t = 36 and t = 7.2 days.

A can do a work in 15 days and B in 10 days. They start together, but B leaves 2 days before the work is completed. In how many total days is the work finished?

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