Posted by cliff on Sunday, February 5, 2012 at 12:21pm.
john types 20/40 or 1/2 page/min
Sue types 20/30 or 2/3 page/min
Bob types 20/24 or 5/6 page/min
combined rate = 1/2 + 2/3 + 5/6 or 2 pages per minute
time at combined rate = 20/2 or 10 minutes
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