Ritu covers a distance of 40 km at 20 km/h and another distance at 40 km/h in 3 hours. Find the average speed for the whole journey.
32 km/h
For the first part, time \(= \frac{\text{distance}}{\text{speed}} = \frac{40}{20} = 2\) hours.
For the second part, the journey is at 40 km/h for 3 hours, so distance \(= 40 \times 3 = 120\) km.
Total distance \(= 40 + 120 = 160\) km, and total time \(= 2 + 3 = 5\) hours.
Average speed \(= \frac{\text{total distance}}{\text{total time}} = \frac{160}{5} = 32\) km/h.
Hence, the average speed for the whole journey is 32 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?
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