A car travels the first 60 km at 45 km/hr and the next 90 km at 60 km/hr. What is the average speed for the entire journey? (Round off your answer to two decimal places.)
52.94 km/hr
Time for first leg: \(\dfrac{60}{45} = 1.3333\) hours.
Time for second leg: \(\dfrac{90}{60} = 1.5\) hours.
Total distance: \(60+90=150\) km; total time: \(1.3333+1.5=2.8333\) hours.
Average speed: \(\dfrac{150}{2.8333} \approx 52.94\) km/hr.
Hence, the average speed for the entire journey is 52.94 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?
