GMAT Prep2?? (Harvesting)

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by aatech » Wed May 14, 2008 8:41 am
Machine H harvests 40 acres in 8 hours.
So, in 1 hour it will harvest 40/8 = 5 acres

Together H and K will harvest 60/5 = 12 acres

So, in 1 hour K will harvest 12-5 = 7 acres