The power of proportion!

I was walking to school, when I saw a UFO land on my school. I ran inside and saw that the aliens were holding Mr.Harbeck hostage, then he yelled. "Noel, save me with your proportion skills." Then I replied, "Don't worry Mr.Harbeck, Noel is here!" So then i grabbed a text book and yelled out the following question:

Delia was paid $35 for 5 h of babysitting. How much should she receive for 3 h? Use a unit rate to find the answer.

This is what I did:
I got to the unit rate per hour, that looked like this:
5h/5=1h
$35/5=$7

So then I got $7/hour.

I then had to get the $ for 3 hours:
1h x 3 = 3hours
$7 x 3 = $21

I saw that one of the tenticles that were holding Harbeck got loose, and it only had 2 tenticles left. So I hit him with another question:

David can saw a log into three pieces in 7 minutes. If he continues sawing at a constant rate, how long will it take him to saw a similar log into 6 pieces?

This is my answers:
To get from 3 pieces to 6 pieces you would have to double it, so I just doubled 7 minutes to get 14 minutes.

Then I noticed a liquid falling onto Harbeck's head, it was the aliens eyeballs. They melted so I decided to give another question a shot and it would die. Here was the last question:

Two quarters has the same value as ten nickels.
What is the values of five quarters in nickels?

Here's what I did:
I used a unit rate to find the answer to this question.

2 quarters / 2 = 1 quarter
10 nickels / 2 = 5 nickels

then I followed up with this;

1 x 5 = 5 quarters
5 x 5 = 25 nickels

Once I finished that sentence the alien exploded and the room was covered in green goo. Harbeck then thanked me and pressed on the intercom; "Office, Can you get Moses down here to clean this up."

THE END!