Question
An aeroplane files 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 aeroplane files 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.
Answer: Option C
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Let each side of the square be x km
and let the average speed of the plane around the field by y km per hour then
x/200 + x/400 + x/600 + x/800 = 4x/y
25x/2500 = 4x/y
y=(2400*4/25)=384
hence average speed =384 km/hr
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