A 40° slope is excavated to a depth of 10 m in a deep layer of saturated clay of unit weight 20 kN.m^{3}; the relevant shear strength parameters are c_{u} = 70 kN/m^{2} and φ_{u} = 0. The rock ledge is at a great depth. The Taylor's stability coefficient for φ_{u} = 0 and 40° slope angle is 0.18. The factor of safety of the slope is :

The ruling minimum radius of horizontal curve of a national highway in plain terrain for ruling design speed of 100 km/hour with e = 0.07 and f = 0.15 is close to