Question

An aeroplane flies along the four sides of a square at the speeds of 200. 400. 600. And 800 km/hr. Then the avrage speed of the plane around the field is

Answer 1

Now, time taken across the first side = distance/speed = 2400/200 = 12 hr. Similarly, times taken across the other three sides = 2400/400 = 6 hrs, 2400/600 = 4 hrs and 2400/800 = 3 hrs. Thus, total distance = 2400*4 = 9600 km.

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