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A strip footing is to be designed for a given total load of 250 kN per m. Determine the width of strip footing by taking a factor of safety of 3 and use Terzaghi' bearing capacity equation.

Take $\gamma=19 kN/m^{3}$, $\phi=35^{\circ}$, C=5 kN/m$^{2}$. The depth of foundation is 1 meter. Bearing capacity factors are given as: N$_{c}$=46, N$_{q}$=33, N$_{γ}$=48.