Mathematics, 18.09.2021 22:40, ThatStudent8769

Thomas can do a piece of work in 72 days; Clark can do it in 120 days; Smith can do it in 90 days. In what time can Smith, Thomas and Clark do it, working together?

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Thomas can do a piece of work in 72 days; Clark can do it in 120 days; Smith can do it in 90 days. I...