Two monitoring wells. 400 m apart. are located along the direction of groundwater flow in a 20 m thick aquifer. If the difference in piezometric head in the wells is 1.6 m and the hydraulic conductivity is 45 m/day. then the rate of flow per meter of distance perpendicular to the flow direction should be equal to _________________

A

3.6 m$$^3$$/d

B

10.4 m$$^3$$/d

C

28.8 m$$^3$$/d

D

36.0 m$$^3$$/d