All of the above - you'll only move as fast and as far as the slowest person in your group. For me that probably means my teen age daughter and wife, my teenage son I know could handle at least 7 miles a day with a full pack based on Scout hikes, my daughter not so much, my wife least of all. If we were hiking out of the area together with full packs we might expect to make as little as 5-7 miles a day, which would call into question why we hit the road in the first place. Like alot of folks I'm probably biased towards sheltering in place, and evacuating from an area as early as possible, and always via a car.