$3.(8$pts$)$ A canal is a trapezoidal in cross section with a bottom width of $10m$ and a side slope

of $2$:$1(H$:$V).$ It conveys $60\frac{m^3}{s}$ of water and has a uniform flow depth of $3\mathrm{.}0m.$

$3a(5$pts$).$ Calculate the Froude number.

$3b(3$pts$).$ Is this subcritical flow or supercritical flow?