Find the center of the door.
70.33/2=35.165cm
Find the center of the towel rack
24.25/2= 12.125cm
The towel rack will be 12.125cm from the center of the door in either direction. To get the location of either end add 12.125cm or subtract 12.125cm from 35.165cm.
Note: I used decimals, this can also be done with fractions.