Jon P. answered 01/30/15
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Work it through step by step...
He wants to make 300 bundles in a day. A bundle is 4 units, so that means he wants to make 4 * 300 units, or 1200 units.
There are 15 boards in a unit, so he wants to make 15 * 1200 boards, or 18000 boards.
One board is 8 feet, so he wants to produce 8 * 18000 feet, or 144000 feet.
But that's in one day, and the question asks how many feet per minute. How many minutes are there in a day? 60 minutes per hour and 24 hours per day means that there are 24*60 minutes per day = 1440 minutes per day.
So he wants to run the line at a rate of 144000 feet per 1440 minutes. So divide 144000 by 1440 and you get 100 feet per minute.