An aeroplane covers the four sides of square field at speeds of 200 km hr 400km hr 600km hr nbs...........

Quantitative Aptitude (CHSL) Average

An aeroplane covers the four sides of square field at speeds of 200 km/hr , 400km/hr , 600km/hr and 800 km/hr .Then the average speed of the aeroplane in the entire journey is ?

384 km/hr

400km/hr

450km/hr

575 km/hr

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Explanation:

Solution:
Suppose the side of the square is 2400 km
[LCM of 200,400,600 and 800 is 2400 kms ] Now,
Average speed = Total distance / Total time = (2400 * 4) /[(2400/200) + (2400/400) +(2400/600)+(2400/800)] = 9600/25 = 384 km /hr