SOLUTION: It takes 3 hours for 2 cement mixers to mix a certain amount. How long would it take 5 cement mixers to do the job?

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Question 431177: It takes 3 hours for 2 cement mixers to mix a certain amount. How long would it take 5 cement mixers to do the job?
Answer by Edwin McCravy(20054) About Me  (Show Source):
You can put this solution on YOUR website!
It takes 3 hours for 2 cement mixers to mix a certain amount. How long would it take 5 cement mixers to do the job?
Since it takes 3 hours for 2 cement mixers,
it would takes 6 hours for 1 cement mixer. Then
5 cement mixers could do it in 1/5 the time it takes
1 cement mixer to do it, so,

1/5 of 6 hours is  expr%281%2F5%29%2A6=expr%281%2F5%29%2Aexpr%286%2F1%29=+6%2F5+=+1%261%2F5

1 and 1/5 hours which is 1 hour and 12 minutes.

Edwin