Practicing Success
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A man walks from point P to Z at a speed if 35 km/h, but comes back from Z to P at a speed of 45 km/h. Find his average speed ( in km/h ) . |
\(\frac{319}{8}\) \(\frac{315}{8}\) \(\frac{313}{8}\) \(\frac{309}{8}\) |
\(\frac{315}{8}\) |
Average speed = \(\frac{2xy}{x + y}\) = \(\frac{2 × 35 × 45}{80}\) = \(\frac{315}{8}\) km/h |
