Phone Company 1 charges a flat rate of $25.00 a month for local calling, and $0.05 per minute for each long-distance call. Phone Company 2 charges a flat rate of $20.00 a month for local calling, and $0.10 per minute for long-distance calling. Part A: Write an equation to represent this situation.

Part B: Use your equation from Part A to determine after how many minutes of long-distance calling do the phone companies charge an equal amount.