While standing near the edge of a farmer's field, Johnny watches a crop duster dust the farmer's field for insect control. Curious as to the plane's speed during each drop, Johnny attempts tan estimate using the angle of rotation from one end of the field to the other, while standing 5oft from one corner. Using a stopwatch he finds the plane makes each pass in 2.35 sec. If the angle of roatation was 83 degrees, how fast (in mph) is the plane flying as it applies the insecticide?

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