The average speed, s, was between 110 and 120 mph.

translate to a inequality

Almost...

"the average speed, s, was..."
so you need to put the variable as "s",
110 < s < 120

If Kay's age, A, is between 16 and 20, we write:

16<A<20.
How would you attempt the question about average speed?

110<A<120

To translate the statement "The average speed, s, was between 110 and 120 mph" into an inequality, we can use the inequality symbols to represent the range.

Since the average speed, s, is between 110 and 120 mph, we can say that s is greater than or equal to 110 mph and less than or equal to 120 mph.

Therefore, the inequality to represent this statement is:
110 ≤ s ≤ 120