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UPSC 2013 CDS 1 Math Paper

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Question : 5

Total: 100

If a body covers a distance at the rate af x‌km∕hr and another equal distance at the rate of y‌km∕hr, then the average sped in km∕hr is

‌
x+y
2
√xy
‌
2xy
x+y
‌
x+y
xy

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