Yes. The relationship is proportional. This is because y is dependent on the changes of x with the constant rate of proportionality.
Direct proportion formula is:
y = kx
where k is the constant of proportionality.
In this case, k = 65 pages. x = number of hours. y = total pages read in x hours.
y = k * x
65 = 65 1 hr
195 = 65 3 hrs
325 = 65 5 hrs
585 = 65 9 hrs
6500 = 65 10 hrs