3.5 miles per hour. 7/8 (.875) divided by 1/4 (.25) equals 3.5. Hope this helps!
The speed for which Brian iron the shirts is given by:

Rewriting we have:


Then, for each minute, we have the amount of ironed shirt is:

Answer:
At this rate, Brian plans 10/162 of his shirt.
The area of the trapezoid is 30