Find the average speed of a car which covers a distance of 14 km in the first 15 minutes and 10 km in the next 15 minutes.
A boy runs for 10 minutes at a uniform speed of 18 km per hour. At what speed should he runs for the next 20 minutes so that the average speed becomes 12 km per hour?
An odometer of a car reads 4200 km at the start of a trip and 4460 km at the end of a trip. If Rajiv took 4 hours 20 minutes to complete the trip.Then find the average speed and average velocity in kilometre per hour as well as in metre per second.