For question 9
You have
0/0 2/1 4/2 6/3
To find the unit rate, divide the numerator and denominator of 4/2 by the denominator, 2 and you will get 2/1
Also divide the numerator and denominator of 6/3 by the denominator 3, and you will get 2/1.
2/1 = 2/1 = 2/1
So, the unit rate would be 2min/1lap or 2 minutes for every 1 lap.