Alex and Jamie work for a landscape company during the spring and summer. When Alex works alone, it takes him 5 hours to finish a spring clean-up in a yard. When Alex and Jamie work together, it takes them 3 hours to finish a yard.

1. Define a variable to represent the time it takes Jamie to finish a yard alone.
2. An equation to represent the time it takes Alex and Jamie to finish a yard together.
3. Solve the equation to determine the time it takes Jamie to finish a yard alone.