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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? |
34 min 30 27 24 |
24 |
Average speed = 2xy/(x + y) Here, x = speed from A to B y = speed from B to A ⇒ Average = 2 × 30 × 20/(30 + 20) ⇒ Average = 24 km/h |
