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An aeroplane 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.

384 km/hr

375 km/hr

432 km/hr

221 km/hr

Explanation:

Let each side of square be 1 km and the average speed of the plane around the field be x km/hr. then,
1/200 + 1/400 + 1/600 + 1/800 = 4/x
= 25 /2400 = 4/x
⇔ x = (2400 x 4/25) ⇒ 384.
So, average speed = 384 km/hr.

By: Amit Kumar

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