An aeroplane flies along the four sides of a square field at the speed of 400, 600, 800 and 200 km/hr. find the average speed of the plane around the field.

An aeroplane flies along the four sides of a square field at the speed

1.	An aeroplane flies along the four sides of a square field at the speed of 400, 600, 800 and 200 km/hr. find the average speed of the plane around the field.
A.	324 km/hr
B.	360 km/hr
C.	384 km/hr
D.	396 km/hr
Answer» D. 396 km/hr

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An aeroplane flies along the four sides of a square field at the speed of 400, 600, 800 and 200 km/hr. find the average speed of the plane around the field.

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