SOLUTION: It take 2 hours for 4 boys to mow 3 lawns of the same size. How long would it take 2 boys to mow 1 of these lawns?

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Question 965701: It take 2 hours for 4 boys to mow 3 lawns of the same size. How long would it take 2 boys to mow 1 of these lawns?
Answer by josgarithmetic(39625) About Me  (Show Source):
You can put this solution on YOUR website!
Uniform Rates for Work or Job;
RT=J for rate time job.

Let one job be, mowing one lawn.

Let r be the amount of lawns per hour for ONE boy.

If 4 boys work together, then this rate is 4r.
Two boys together have rate of 2r.

Let t be how much time for two boys to do the described ONE of these lawns.
system%28%284r%292=3%2C%282r%29t=1%29;

Solve the system.