B$.$ Refer to the constant$-$head permeability test arrangement in a two$-$layered soil as shown in Figure $6$ which shows three $(3)$ layers of soil in a tube that is $100mm100mm$ in cross section. Water is supplied to maintain a constant$-$head difference of $300$ mm across the sample. The hydraulic conductivities of the soils in the direction of flow through them are as follows $($Table $2)$:

$\backslash$table$[[$Soil$,K(c\frac{m}{sec})$