Karen and abby both plan to run for a spot on the school board in their city. they must each collect a certain number of signatures, but abby just started and doesn't have any yet. karen is collecting signatures at an average rate of 5 per hour, while abby can get 10 signatures every hour. assuming that their rate of collection stays the same, eventually the two will have collected the same number of signatures. how many hours will have gone by? how many signatures will they both have?