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It took a small plane 2 hours longer to fly 375 miles against the wind than it took the plane to fly the same distance with the wind. The rate of the wind was 25 mph. Find the rate of the plane in calm air.

A milk truck driver for a Farm Co. has to start at the plant, pick up milk on 10 different farms. How many ways can the driver visit each farm and return to the plant? Note: I created a graph with 10 vertices (A-J) for each farm.

The sum of a two-digit number is 9. The number itself is 12 times the tenth digit minus 6 times the unit digit. Find the number.