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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Important Questions from Average Speed
A car runs first 275 km at an average speed of 50 km/h and the next 315 km at an average speed of 70 km/h. What is the average speed ( in km/h) for the entire journey?
Akhil rides first 12 km at a speed of 16 km/h and further 6 km at a speed of 20 km/h. Find his average speed (in km/h).
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X and Y travel a distance of 90 km each such that the speed of Y is greater than that of X. The sum of their speeds is 100 km/h and the total time taken by both is 3 hours 45 minutes. The ratio of the speed of X to that of Y is:
If a man travels at \(\frac{1}{x}\) km/h on a journey and returns at \(\rm \frac{1}{x^2}\) km/h, then his average speed for the journey is:
