An airplane flies along the four sides of square field at speeds of 200, 400, 600 and 800 km /hr . The average speed of the plane in the flight around the field in km/hr is..
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v1 = 200
v2 = 400
v3 = 600
v4 = 800
t = 4 hrs
average velocity = v1+ v2 + v3 + v4 / 4
= 200+400+600+800/4
=2000/4
=500 km/h
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