Hello!
In order to find this out we should first know the ratio for the time and distance. So it takes her 4 minutes to go 2 blocks. So the ratio looks like this: 4:2. If we are trying to find 9 blocks, then multiply it by 4 and just add the other two minutes .
So in total your answer is: It takes Maya 18 minutes to walk 9 blocks.
I hope it helps!