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January 25, 2015

January 25, 2015

Posted by **kathy** on Wednesday, March 10, 2010 at 7:46pm.

- algebra -
**drwls**, Wednesday, March 10, 2010 at 7:56pmLet that time be called T.

1/T = 1/18 + 1/14

1/T = 0.1270

T = 7.88 hours

That is more than half the time of the LaserJet alone.

The reason for the odd number is that you have to add have to the rates of doing the job. You don't average the times and divide by 2.

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