It takes Sarah 6 hours to paint the first fence while John is half way thru the second fence. Sara is twice as fast as John.
6+6=12 man hours so it counts as 6 actual hours with one half of the second fence remaining. Sarah will have half of that fence finished before John finishes half of the...
It depends what Sarah is wearing? If she is wearing next to nothing and Sarah is warm for his form the fence may never get finished. If she is dressed like a nun the fence may get painted in record time.
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