A man walks 6 km at a speed of 6 km/h and then runs 18 km at a speed of 9 km/h. What is his average speed (in km/h) for the entire distance?
8
Time taken to walk 6 km \(= \frac{6}{6} = 1\) hour.
Time taken to run 18 km \(= \frac{18}{9} = 2\) hours.
Total distance \(= 6 + 18 = 24\) km, and total time \(= 1 + 2 = 3\) hours.
Average speed \(= \frac{24}{3} = 8\) km/h.
Hence, his average speed for the entire distance is 8 km/h.
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