A supersonic aircraft with wheel base of 35 meters and the tread of main landing gear is 6.6 meters has a design turning speed of 70 kmph for a type A airport as per ICAO. Assuming the coefficient of friction between tires and pavement surface as 0.13, width of taxiway as 23 m, and edge distance as 6 m, then the radius of taxiway (in m) is ____