A fully submerged infinite sandy slope has an inclination of $30^{\circ}$ with the horizontal. The saturated unit weight and effective angle of internal friction of sand are $18 \mathrm{kN} / \mathrm{m}^{3}$ and $38^{\circ}$, respectively. The unit weight of water is $10 \mathrm{kN} / \mathrm{m}^{3}$. Assume that the seepage is parallel to the slope. Against shear failure of the slope, the factor of safety (round off to two decimal places) is
A fully submerged infinite sandy slope has an inclination of $30^{\circ}$ with the horizontal. The saturated unit weight and effective angle of internal friction of sand are $18 \mathrm{kN} / \mathrm{m}^{3}$ and $38^{\circ}$, respectively. The unit weight of water is $10 \mathrm{kN} / \mathrm{m}^{3}$. Assume that the seepage is parallel to the slope. Against shear failure of the slope, the factor of safety (round off to two decimal places) is