A helicopter flies along the four sides of a square field at the speed of 100 kmph 200 kmph 300 kmph...........

Quantitative Aptitude (CDS) Time & distance

A helicopter flies along the four sides of a square field at the speed of 100 kmph,200 kmph,300 kmph,400 kmph. Find the average speed of the helicopter around the field?

192 kmph

129 kmph

195 kmph

200 kmph

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Explanation:

Let each side of the square be x km.
and let the average speed of the plane around the field be y kmph.
Then, x/100 + x/200 + x/300 + x/400 = 4x/y
25x/1200 = 4x/y
y = (1200×4)/25 = 192
Average speed = 192kmph