A car travels 120 km at 40 km/h, 120 km at 60 km/h, and 100 km at 80 km/h. What is the average speed of the car for the whole journey?
54.4 km/h
Time for each leg: \(\tfrac{120}{40}=3\) h, \(\tfrac{120}{60}=2\) h, \(\tfrac{100}{80}=1.25\) h.
Total distance: \(120+120+100 = 340\) km. Total time: \(3+2+1.25 = 6.25\) h.
Average speed: \(\dfrac{340}{6.25} = 54.4\) km/h.
Hence, the average speed of the car for the whole journey is 54.4 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?
A scooter from P to Q travels at 40 km/h and from Q to P at 30 km/h. What is the average speed of the scooter?
