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I travelled from Bandung to Jakarta at a constant speed of 20 km/h. Then, I went back from Jakarta to Bandung at a constant speed of 30 km/h. What is the average speed between those 2 trips in km/h?

Jul 8, 2020

Hi Guest! This is the harmonic mean problem. The answer is $$\frac{2}{\frac{1}{30} + \frac{1}{20}}=24$$