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During a race, a driver accelerates 10 feet/second^2 for 3 seconds to pass another car. The driver's initial speed was 264 feet/second.
During a race, a driver accelerates 10 feet/second^2 for 3 seconds to pass another car. The driver's initial speed was 264 feet/second. The driver's average speed during the 3 seconds of acceleration to the nearest foot per second was ______ feet/second. (Enter only the number.)