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Angle a is 80, angle d is 100, angle c is 100
Plane averaged 88mph with the wind and 44 against the wind. the average of these two averages is 66 mph. plane speed in still air is 66 and the wind speed was 22 (88-22=66 and 44+22=66)
The 105 per hour mechanic worked for 10 hours and the other worked for 15. here's the math.