यदि एक आदमी \(\frac{1}{x}\)किमी/घंटा की गति से यात्रा करता है और \(\rm \frac{1}{x^2}\) किमी/घंटा की गति से वापस आता है, तो यात्रा में उसकी औसत गति कितनी है?

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SSC CGL 2022 Tier-I Official Paper (Held On : 02 Dec 2022 Shift 3)
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  1. \(\rm \frac{x+1}{x^2}\)
  2. \(\rm \frac{2}{x+x^2}\)
  3. \(\rm \frac{1}{x+x^2}\)
  4. \(\rm \frac{2x^2}{x+1}\)

Answer (Detailed Solution Below)

Option 2 : \(\rm \frac{2}{x+x^2}\)
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दिया गया है:

एक आदमी \(\frac{1}{x}\)किमी/घंटा की गति से यात्रा करता है और \(\rm \frac{1}{x^2}\) किमी/घंटा की गति से वापस आता है,

प्रयुक्त सूत्र:

औसत गति = \(\frac{2\times speed_1\times speed_2}{speed_1 + speed_2}\)

गणना:

औसत गति = \(\frac{2\times\frac{1}{x}\times\frac{1}{x^2}}{\frac{1}{x}+\frac{1}{x^2}}\)

⇒ \(\frac{\frac{2}{x^3}}{\frac{x + 1}{x^2}}\)

⇒ \(\rm \frac{2}{x+x^2}\)

∴ औसत गति \(\rm \frac{2}{x+x^2}\) है।

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