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A person goes from A to B with a speed of 30 km/h. He comes back from B to A with a speed of 20 km/h. What is his average speed for the entire journey? |
26.5 km/h 24 km/h 25 km/h 27.5 km/h |
24 km/h |
Average speed = \(\frac{2 × S1 × S2}{S1 + S2}\) = \(\frac{2 × 30 × 20}{30 + 20}\) = \(\frac{120}{50}\) = 24 km/h |
