Algebra - Ch. 2: Word Problem (27 of 46) Type 8: Rate of Doing Work: Ex. 4

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In ths video I will solve Type 8 of Example 4 word problem: Jim can plow a field in 20 hours. Tom can do it in 24 hours. And Mary can do it in 30 hours. How long will it take if they all plow it together?

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