Quantitative Aptitude Speed Time and Distance Average Speed

If a man travels at \(\frac{1}{x}\) km/h on a journey and returns at \(\rm \frac{1}{x^2}\) km/h, then his average speed for the journey is:

1
\(\rm \frac{x+1}{x^2}\)
2
\(\rm \frac{2}{x+x^2}\)
3
\(\rm \frac{1}{x+x^2}\)
4
\(\rm \frac{2x^2}{x+1}\)

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