TeamB; team A has built 8 castles in 2 hours, so find the unit rate which is 8/2 which is 4, so team A has built 4 sandcastles in an hour, while team b has built 5 sandcastles in an hour. So team B has worked at a faster rate. Hope this helps!
[tex]team \: a \\ 8 \: in \: number \: with \: in \: 2hours \: \\ so \: in \: 1hour \frac{8}{2} = 4 \\ \\ team \: b \\ 5 \: in \: number \: in \: 1 \: hour \\ so \: b \: is \: fast \\ thank \: you[/tex]
