Answer:
The expression that calculates the speed in meters per second of an object that travels a distance of 100 m every 20 s is

Explanation:
We are given:
Distance = 100 m
Time = 20 s
We need to find:
Speed
The formula used is:

Putting values and finding the expression

So, the expression that calculates the speed in meters per second of an object that travels a distance of 100 m every 20 s is

Note: Kindly recheck your options, As option B is not written correctly.