A bus covers \(\dfrac{1}{10}\) of a distance from one place to another at a speed of 25 km/hr, \(\dfrac{1}{5}\) of the distance at the speed of 8 km/hr. At what speed would it be supposed to cover the remaining distance to have an average speed of 15.625 km/hr?
20 km/hr
With the bus covering 1/10 of the distance at 25 km/hr and 1/5 at 8 km/hr, solving for the remaining 7/10 of the distance so that the overall average speed is 15.625 km/hr gives a required speed of 20 km/hr. Hence, 20 km/hr is correct.
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Important Questions from Average Speed
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?
To cover a distance of 144 km in 3.2 hours what should be the average speed of the car in meters/second?
A cylindrical road roller having a diameter of 1.5 m moves at a speed of 3km/h while levelling a road. How much length of the road will be levelled in 45 minutes?
