A bird flies along the three sides of a field in the shape of an equilateral triangle at speeds of 2, 4, 8 km/hr, respectively. The average speed of the bird is
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Answer: 3.42 (approx) - this is the average speed
Step-by-step explanation:
average speed = total distance / total time taken
distance = d + d + d ( d is side of equilateral triangle)
time taken = d/2 , d/4 , d/8 ( d/v = time )
so average speed = 3d / d/2 + d/4 + d/8
=>3d / 4d/8 + 2d/8 + d/8
=> 3d / 7d / 8
=>3d * 8 / 7 d
=> 3 * 8 / 7
=>24 / 7
= 3.42 (approx) - this is the average speed
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