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Solve. A plane flies 720 miles against a steady 30 mile per hour headwind and than returns to the same point with the wind. If the entire trip takes 10 hours, what is the plane's speed in still air?

Solve. Ariana took 2 hours longer to drive 360 miles on the first day of a trip than she took to drive 270 miles on the second day. If her speed was the same on both days, what was the driving time each day?

A certain city has a circular wall around it, and this wall has four gates pointing north, south, east and west. A house stands outside the city, three miles north of the north gate, and it can just be seen from a point nine miles east of the south gate. The problem...