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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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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