Several identical sprinkler nozzles, each having discharge $Q$ (litre per minute), are spaced in a grid of size $L$ (metre) $\times S$ (metre). The application rate in $\mathrm{mm} \mathrm{h}^{-1}$ is
(A) $\frac{60 Q}{L S}$
(B) $\frac{3600 Q}{L S}$
(C) $\frac{L S}{60 Q}$
(D) $\frac{L S}{3600 Q}$
Several identical sprinkler nozzles, each having discharge $Q$ (litre per minute), are spaced in a grid of size $L$ (metre) $\times S$ (metre). The application rate in $\mathrm{mm} \mathrm{h}^{-1}$ is
(A) $\frac{60 Q}{L S}$
(B) $\frac{3600 Q}{L S}$
(C) $\frac{L S}{60 Q}$
(D) $\frac{L S}{3600 Q}$