Work Place: 1 landscaper can till the soil for a lawn in 30 minutes, and it take

Question

Work Place:   1 landscaper can till the soil for a lawn in 30 minutes, and it takes the 2 landscaper 15 minutes to do the same job! How long would it take to till the soil for the lawn with BOTH landscapers working together?

Explanation / Answer

L1 can till all of the soil in 30 minutes => L1 can till 1/30 of the soil in 1 minute L2 can till all of the soil in 15 minutes => L2 can till 1/15 of the soil in 1 minute When L1 and L2 are used together, (1/15) + (1/30) = (2/30) + (1/30) = 3/30 = 1/10 of the soil can be tilled in 1 minute, so it will take 10 minutesto till all of the the soil

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