Candice and bob both plan to run for a spot on the school board in their city. they must each collect a certain number of signatures to get their name on the ballot. so far, candice has 45 signatures, but bob just started and doesn't have any yet. candice is collecting signatures at an average rate of 5 per hour, while bob can get 20 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?