SOLUTION: If you and your brother take 30 minutes to wash a car how long would it take if you can together? What if you take an hour?

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Question 899328: If you and your brother take 30 minutes to wash a car how long would it take if you can together? What if you take an hour?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi

1%2F30+%2B+1%2F30+=+1%2Fx|Multiplying thru by 30x so as all denominators = 1

   x + x = 30

    2x = 30

     x = 15min

1%2F2+%2B+1%2F1+=+1%2Fx+  |Multiplying thru by x so as all denominators = 1

   x + x = 1

   2x = 1

   x = .5 hr Or 30min