With a large power mower (John Deere 20 horsepower, 42-inch cut) it takes Amos 3 hours to mow a particular lawn. Using a smaller mower (Toro 8 horsepower, 32-inch cut) it takes Andy 6 hours to mow the same lawn.  If Amos and Andy work together, using the two mowers, how long will it take to mow this lawn?

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