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Machine # 1 works at a rate of 1/2 truckload per hour, while machine 2 works at a rate of 1/4 truckload per hour. The two machines together work at a rate of 3/4 truckload per hour complete the job 1/(3/4) = 1-1/3 hours.
There are pint cartons and there are quart cartons. There are also 1/2-pint cartons. We have also seen 1/2-gallon cartons, but we have not seem a gallon carton.
2 can fit into 77, 38 times with a remainder of 1.
78
2 micrometers=0.002 millimeters