Mathematics, 12.09.2019 05:30 arthurdolz

It takes a boy 20 minutes to mow the lawn, but his sister can mow it in 60 minutes. how long would it take them to mow the lawn if they worked together, using two lawn mowers?

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It takes a boy 20 minutes to mow the lawn, but his sister can mow it in 60 minutes. how long would i...

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