Answer: 3.75 ft
Explanation:
Here we are given the measure of the length of a window. Generally the length is given in the International System of units format (meters); however, in this case we are given the length in feet and inches:

Now, before converting this whole measure to feet, we have to know that 
 , then we can perform the conversion:
, then we can perform the conversion:

This means 

Hence:
 This is the measure of the length of the window in feet.
 This is the measure of the length of the window in feet.