The average speed for journeys covering equal distances at different speeds is the harmonic mean of the speeds, which is $\frac{2}{\frac{1}{v_1} + \frac{1}{v_2}} = \frac{2v_1 v_2}{v_1 + v_2}$.
A bus covers the first half of a certain distance with speed v1 and the second half with a speed v2. The average speed during the whole journey is :
Asked in UPPCS Prelims 2024 · Topic: Mechanics (Newton's Laws of Motion and their applications)
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