Iosue
Legend
Well, one thing this little hunt for foot patrol pictures has taught me is that photographers like taking pictures of patrols from the front or back. So with foreshortening it's hard to get a good grasp of distance.
Here are perhaps some better pictures:
Lines seem to get more bunched together in close quarters, such as narrow city streets. Still, 150 feet between the lead and the rear for a group of 20 does not seem out of line, and indeed perhaps a little short.
That said, 40 feet radius is 80 feet diameter. If you've got a patrol keeping roughly 5m (15 ft) distance from each other and you place your spell in the middle, it's going to nail five of them, maybe six. Even more if they're in two files.
But seriously? This is why D&D is fun. Maybe the patrol is well-trained. Maybe they're chumps. Maybe they're walking single file, maybe in two lines. Maybe they're clumped together, maybe they're spread out in width as well as length. We have a myriad of possibilities we can face, all calling for different tactics and strategies.
Here are perhaps some better pictures:


Lines seem to get more bunched together in close quarters, such as narrow city streets. Still, 150 feet between the lead and the rear for a group of 20 does not seem out of line, and indeed perhaps a little short.
That said, 40 feet radius is 80 feet diameter. If you've got a patrol keeping roughly 5m (15 ft) distance from each other and you place your spell in the middle, it's going to nail five of them, maybe six. Even more if they're in two files.
But seriously? This is why D&D is fun. Maybe the patrol is well-trained. Maybe they're chumps. Maybe they're walking single file, maybe in two lines. Maybe they're clumped together, maybe they're spread out in width as well as length. We have a myriad of possibilities we can face, all calling for different tactics and strategies.