Q: If 6 people take 3 days to dig 8 ditches, working at the same rate how long will it take 4 people to dig 10 ditches?

A: 5.625 days

18 people days to dig 8 ditches = 2.25 people days per ditch

10 ditches = 22.50 people days

22.50 / 4 = 5.625 days.