This calculator is a 3 in 1 tool. You can easily calculate average speed having time and distance (given in different units of length e.g. miles, yards, meters, kilometers, inches etc.) but you can also compute traveled distance having time and average speed (given in different units of speed mph, kmh, mps yds per second etc.) and you can get travel time having average speed and distance. See, how fast and easily you can calculate speed having distance and time, how to find distance having time and speed and how to find time having speed and distance.