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Question:

An aircraft flies over Boondock Air Force Base at 10:20 a.m. At 10:32 a.m., the plane passes over Sea Side Naval Air Station, 120 miles away. How fast is the aircraft traveling?

A 600 mph
Explaination

The aircraft travels 120 miles in 12 minutes, which is 1/5 of an hour. Therefore, in 55 (one) hour, it would travel 5 × 120, or 600 miles. The aircraft is traveling 600 miles per hour.