A person covers first 1.5 km at 5 km/h and next 3 km at 6 km/h, then his average speed is

Solution

The first stretch takes $$\frac{1.5}{5} = 0.3$$ hours and the second takes $$\frac{3}{6} = 0.5$$ hours, so the total time is $$0.8$$ hours for a total distance of $$4.5$$ km. The average speed is $$\frac{4.5}{0.8} = \frac{45}{8}$$ km/h.

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