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

An airplane flies along the four sides of a square at the speeds of 200, 400, 600 and 800 km/hr. Find the average speed of the plane around the field. Correct Answer 384 km/hr

Average Speed = total distance total time4 sides , So total distance  = 4xspeed 200 km/hr for  = x200" 400  "   " =  x400"  600 " "   = x600and "  800  " "  = x800Total time  = x200 + x400 + x600 + x800" = 12x + 6x + 4x + 3x2400 = 25x2400.'. Average speed  = 4x25x2400 = 4x×240025x = 384 km/hr 
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