An aeroplane flies around a square field ABCD of each side 1000 km. Its speed along AB is 250 km/h,along BC 500 km/h,along CD 200 km/h,and along DA 100 km/h. Its average speed(in km/h)over the entire trip is. along BC 500 km/h along CD 200 km/h An aeroplane flies around a square field ABCD of [...]