How can models and equations help me subtract like fractions?

How do you use the elimination method for this question? explain, because i really want to understand!

Which basic geometric term has no width, no length, and no thickness? line b. point c. angle d. plane

Two cyclists 84 miles apart start riding toward each other at the same. one cycles 2 times as fast as the other. if they meet 4 hours later, what is the speed (in mi/h) of the faster cyclist?