The cement concrete (with a modulus of elasticity, E = 3.0 × 105 kg/cm2 and Poisson's ratio, μ = 0.15) is used for the construction of a pavement of 18 cm thickness. If the modulus of subgrade reaction is 6 kg/cm3, the radius of relative stiffness would be:
1
70.6 cm
2
52.15 cm
3
98.15 cm
4
111.186 cm