Two car owners are in need of car repairs. Darnel will need to pay the mechanic $10 per hour for labor, plus $20 to cover the cost of new parts. Troy will need to pay $5 for parts and $15 per hour for labor.

Depending on how long each repair takes, the two jobs might end up costing the same amount. How much time would that take, and how much would it cost? Express your answer as an ordered pair (x, y), where the x-axis is the number of hours and the y-axis is the cost.