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QNita can mow a lawn in 90 minutes

Nita can mow a lawn in 90 minutes. Pedro can do it in 60 minutes. If Pedro starts 10 minutes after Nita has begun, how many minutes are needed to mow the lawn?

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#1kavonAnswered at 2013-03-14 16:52:21
Nita 90 minutes she does 1/90 of the job in 1 minute pedro 60 minutes he does 1/60 of thejob in 1 minute Together they will do 1/90+ 1/60 Together they will do 1/36 of the job in one minute in 10 minutes Nita does 10*1/90 of the job =1/9 of the job. Balance remaining when pedro joins = 1-1/9 = 8/9 of the job. they do 1/36 of the job in 1 minute for 8/9 of the job they will take (8/9)/(1/36) 8/9*36/1 =32 minutes =32 minutes to mow the lawn.
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