The average speed is a rough description of how fast an object moving at variable speeds moves at -- or

The average speed is a rough description of how fast an object moving at variable speeds moves at -- or

The standard answers are as follows:
Average speed is a rough description of how fast an object moving at variable speed moves (over a distance) or (over a period of time)
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The average speed can describe the speed of variable speed motion
2. In variable speed linear motion, the ratio of a distance to the -------- used to pass the distance is the average speed of the distance. Help me solve these two problems,

In variable speed linear motion, the ratio of a distance to the time taken to pass the distance is the average speed of the distance

It is used to describe the average distance of a certain distance (or a certain period of time) outside an object moving in a variable speed linear motion____ The calculation formula is____

Speed x displacement / time t