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Sam can mow a lawn in 20 min, while takes 10 min longer to mow the same lawn. How long will they take to mow the lawn if they work together?

Sam can mow a lawn in 20 min, while takes 10 min longer to mow the same lawn. How long will they take to mow the lawn if they work together? Correct Answer 12 min

In 1 minute, Sam mows 1/20 of the lawn In 1 minute, Mark mows 1/(20 + 10) = 1/30 of the lawn (1/20 + 1/30) = 5/60 = 1/12 of the lawn takes 1 minute So, whole(1) lawn takes 12 minutes

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