Three friends Arshdeep, Sandeep and Avtar are on a trip by a car. Arshdeep drives during the first 3 hours at an average speed of 52 km/hr. Sandeep drives during the next 4 hours at an average speed of 65 km/hr. Avtar drives for the next 3 hours at an average speed of 76 km/hr. They reached their destination after exactly 10 hours. Their average speed during the journey was:
64.4 km/hr
Average speed \(= \dfrac{\text{total distance}}{\text{total time}}\), so first find the distance in each leg.
Arshdeep: \(52 \times 3 = 156\) km.
Sandeep: \(65 \times 4 = 260\) km.
Avtar: \(76 \times 3 = 228\) km.
Total distance \(= 156 + 260 + 228 = 644\) km in 10 hours.
Average speed \(= \dfrac{644}{10} = 64.4\) km/hr.
Hence, the average speed during the journey is 64.4 km/hr.
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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?
