1. Sarah has a collection of nickels, dimes, and quarters worth $22.25. She has 10 more dimes than nickels and twice as many quarters as dimes. How many coins of each kind does she have?

2. Abby has 47 coins, consisting only of dimes and quarters, worth $8.45. How many dimes and how many quarters does she have?

3. Two airplanes leave Chicago at the same time and fly in opposite directions. If one travels at 150 miles per hour and the other at 490 miles per hour, how long will it take for them to be 3000 miles apart?