Three people

Three people start doing work at the same time. The first worked only 2 hours, and the second finished 3 hours before the end. On an individual basis, it would take the first time to do the work 10 hours, the second 12 hours, and the third 15 hours. How many hours did it take to work together under these conditions?

Correct answer:

t =  7 h

Step-by-step explanation:


2/10 + (t-3)/12 + t/15 = 1

9t = 63


t = 63/9 = 7

t = 7

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