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The fastest time Mary can wash her car is four minutes toms fastest time is six minutes What is the fastest time if they washed it together?
Wiki User
∙ 13y ago
Time to complete entire job at combined rates of work
Time = 1 / (1/4 + 1/6)
Time = 1 / (3/12 + 2/12) = 1 / (5/12)
Time = 12/5 = 2.4 min = 2 min 24 sec
Wiki User
∙ 13y ago
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