You run the length of a 100-yard football field. You also run the length of the 2 end zones that are 10 yards each. It takes you 40 seconds to run the entire distance. How many yards per second do you run?
If the total distance you ran was 120 yards, then you would have to divide that distance by the time it took you to run the full length. 120/40 is 3. It took you one second to run three yards. Let me know if this helps.