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A girl goes from M to N at a speed of 25 km/h and returns to M at a speed of 37.5 km/h, via the same route. What is the girl's average speed (in km/h)? |
30 32 31.25 27.5 |
30 |
Average Speed = \(\frac{2 × S1 × S2 }{S1 + S2 }\) = \(\frac{2 × 25 × 37.5 }{25 + 37.5 }\) = \(\frac{2 × 25 × 37.5 }{62.5 }\) = 30 km/h |
