A travls 1/3 of his journey at the speed of 10 kmph and half of the rest at speed of 20 kmph and rest at 30 kmph what is theaverafe speed of a
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When a man walks the same distances with different speeds, the average speed is the harmonic mean of the individual speeds. The harmonic mean of 3 numbers, say a, b and c = 3abc / (ab + bc + ca).
Therefore, average speed of the whole journey =
3 x 50 x 30 x 7 / (50 x 30 + 30 x 7 + 7 x 50) km/hr = 31500/2060 km/hr = 15.3 km/hr.
Therefore, average speed of the whole journey =
3 x 50 x 30 x 7 / (50 x 30 + 30 x 7 + 7 x 50) km/hr = 31500/2060 km/hr = 15.3 km/hr.
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