The headlights on a car operate typically at 60 W and the parking lights typically at 5 W. Assuming there are two main headlights and four parking lights, what length of time will it take to discharge a 60 Ah battery, if the lights are left on? I'm trying to practice my problem solving skills, but I'm just a bit suck here. Could someone please offer me a hint? No solutions of course. Would I add the the power of all the lights together?