I’ve always been confused by @nate rationale for eating on the bike during workouts as a means to fuel for the next. It’s certainly viable, but it doesn’t really seem necessary unless we’re avoiding meals post ride—which you shouldn’t.
You should be well recovered from a nutritional stand point if you eat your regularly scheduled meals post-ride.
If rider A does her workout at 6pm, she will have dinner, perhaps a pre-bed snack, breakfast and lunch prior to the next workout. I would be curious to know if food eaten on the bike prior to the subsequent workout would even be a fuel source for the next workout. My guess is that it wouldn’t.