1. A clay soil sample is tested in a triaxial apparatus in consolidated drained conditions at a cell pressure of 100 kN/m². What will be the pore water pressure at a deviator stress of 40 kN/m²?

2. A conventional drained triaxial compression test was conducted on a normally consolidated clay sample under an effective confining pressure (σ₃) of 200 kPa. The deviator stress (σ_d) at failure was found to be 400 kPa. An identical specimen of the same clay sample is isotropically consolidated to a confining pressure (σ₃) of 200 kPa and subjected to standard undrained triaxial compression test. If the deviator stress at failure (σ_d') is 150 kPa, the pore pressure developed in kPa is ____.