A car travels 120 km at 40 km/h, 180 km at 60 km/h, and 100 km at 50 km/h. What is the average speed of the car for the entire journey?
50 km/h
Total distance: \(120+180+100=400\) km.
Total time: \(\tfrac{120}{40}+\tfrac{180}{60}+\tfrac{100}{50} = 3+3+2 = 8\) hours.
Average speed: \(\dfrac{400}{8}=50\) km/h.
Hence, the average speed of the car for the entire journey is 50 km/h.
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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.
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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