In a projectile motion, there are two components: horizontal and vertical. The vertical component is in a uniformly accelerated motion. The motion is always directed downwards due to the force of gravity. The horizontal component (constant velocity) on the other hand must move in the horizontal axis. They can never be parallel on the trajectory.
They can only by parallel during a free fall motion, wherein no change of horizontal direction occurs.
Essentially you would divide 65 into six groups. Because you are dividing the amount of liquid into six cups. Hope this answers your question, ask me any other questions you might have.
