A train travels at a speed 50 km/hr for 0.5 hr, at 30 km/hr for next 0.26 hr and then 70 km/hr for next 0.76 hr. Determine the average speed of the train.

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Solution

Average speed $= \frac{50 \times 0.5 + 30 \times 0.26 + 70 + 0.76}{0.5 + 0.26 + 0.76} = \frac{25 + 7.8 + 53.2}{1.5} = \frac{86}{1.5} m / s = 57.34 m / s$

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