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Union or Non-Union Workers?

If 248 men, in 5 days of 11 hours each, dig a trench 230 yards long, 3 wide, and 2 deep; in how many days of 9 hours long will 24 men dig a trench 420 yards long, 5 feet wide, and 3 deep?

Solution:

Source: The Scholar's Guide to Arithmetic, 1780