Show all work as you solve the following problems and write including appropriate units.
- Mei left home and drove east. One hour later Bill left driving 15 mph faster in an effort to catch up to her. After three hours Bill finally caught up. Find Mei's average speed.
- Maria put $65,000 in an education account on the day her daughter was born. If the account earned 4.85% interest compounded quarterly, what was the total in the account when her daughter turned 18? Round the final answer to the nearest cent.