Just sharing my experience, FWIW, I did one year of private school with my oldest in 3rd grade (full day) and my middle in K (half day), then my youngest at home (he was 4 yo). It was 20 minutes each way, so it was close enough that I went back and forth to bring them to school, then again at 11:30 to pick up my K'er, then again to pick up my 3rd grader at 2:30. It was horrendous! And it was very expensive. It was part of the reason I was driven to hs'ing.
Anyway. Maybe you could make it work, but think long and hard about the day to day grind of it. Sometimes things look doable on paper, but are really difficult when they actually play out IRL.