Just a warning: It's been about four years since I've actually done any algebra. Longer since I've done it well.
I assume "r" stands for rate of travel and "t" is for time elapsed? "d" therefore being distance traveled?
1. d = 165 miles. "r" is 55 miles an hour, which is multiplied by "t," which is 3 hours. So you simply multiply 55 by 3, and presto, the answer is 165.
Now that you've seen how I've done that, I'll let you work the rest out for yourself. This is very simple algebra; I'm not very good at algebra and I solved it easily, so you should be fine now that you've had it illustrated for you.
For my own amusement though, and so you can check your answers - please don't cheat, you'll only hurt yourself in the long-run - I'll spoiler the other answers.
I hope I got all that right.