A carpenter's square is a ruler which looks like a right triangle. Being such, it has a long side and a short side. Assuming that the radius of each wheel is the size of the short side, we can use this to measure the mid point of the wheel. The mid point of the wheel is the optimal point where you can bore a hole.

so... you tells us, which filling rate is the bigger and thus faster one?
Answer:
D
Step-by-step explanation:
Well, in slope-intercept form, the equation will be y = x + 4. In standard form, the equation will be x - y = -4.