Question
Sunil covered 50% of his journey at 90 km/h and rest at
150 km/h. Determine the average speed of Sunil during the entire journey.Solution
We know that when distance covered is equal, then average speed is harmonic mean of both speeds. So, average speed = [(2 × 90 × 150)/(150 + 90)] = 112.5 km/h
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