He practiced for 1 hour and 30 minutes
Hey!
When you're dividing fractions, you have to keep, change, flip
Keep 3/4
Change ÷ to ×
Flip 1/8 = 8/1
That gives you:

<em>That means your answer is the 2nd choice</em>
Good luck and hope this helps! :)
FYI this is probably the easiest question I have ever seen. Just use a calculator. The answer is 9R1
EF=9 cm. Both triangles are the same.