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 person covers a certain distance at the speed of 60 kmph and returns to the starting point at a speed of 40 kmph . Find the average speed (in km/hour) of the person for the whole journey.
A train runs at a speed of 28 kmph for 4 hours and 30 kmph for 5 hours and the remaining 40 kms in one hour. What is the average speed per hour?
Kapil travels for 4.5 hours at a speed of 50 km / h and 7.5 hours at a speed of 70 km / h. At the end of it, he finds that he covered only 6/7 of the total distance. At what average speed should he travel so that the remaining distance traveled in 5 hours?
A car has to cover 125 kms in 5 hours. What will be the average speed of the car if it has covered 90 kms in the first 3 hours?
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