How I stopped an Alien Invasion using Proportion

I was inside my house and then I heard a loud sound comming from my yard. When I looked what it is I was a UFO. The UFO's door opened and a tall, skinny like jelly came out and said " I'm going to take over your planet earth until you tell me what proportion means and giving me 3 equations to know how to use it." So I told then what proportion mean "That proportion is a relationship that says two ratios, or two rates are equivalent ans that it can be explained as a fraction or ratio table" And so after i told them that I gave them 3 questions.





A) Riding a bicycle 50km in 2h find the Unit Rate:









B)A pack of 20 pencils for $4.98, find the unit rate.










C) Running 800m, in 160 s, find the unit rate.