Separate triaxial compression tests are performed on identical soil samples. The soil is a saturated mixed soil. Both tests follow the procedure for consolidated-undrained conditions. At failure, the respective minor and major principal stress values are 20 kPa and 46 kPa for one and 40 kPa and 80 kPa for sample two. From these data, determine the value for (phi)cu and the cohesion intercept c on the Mohr's circle shear stress coordinate. (This problem can be solved graphically using Mohr's circle).