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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

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

By: Pranav Gupta

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