one Saturday you want to put in 3 volunteer hours at the food bank you need to be home for dinner at 6:

one Saturday you want to put in 3 volunteer hours at the food bank you need to be home for dinner at 6:00pm your walk to the food bank takes 30 minutes but you can catch a ride with a friend after your done so it takes only 10 minutes to get home. When do you need to leave for the food bank in order to get home in time for dinner? Show your work