seismic refraction problem: I need solving for the problem in detail

Problem 4- Plot T-D curves and calculate V0, V1, V2, Z0, Z1, Tin1, and Tin2 Problem 5- In the picture below: Draw and label the paths and time distance curves of the direct ray and the refracted ray to both geophones. Note that geophone 1 is at the critical distance and geophone 2 is at the crossover distance. You don't have to make your drawing perfectly to scale, but use a straight edge and label the critical angle, ic, everywhere that it occurs. Problem 4- Plot T-D curves and calculate V0, V1, V2, Z0, Z1, Tin1, and Tin2 Problem 5- In the picture below: Draw and label the paths and time distance curves of the direct ray and the refracted ray to both geophones. Note that geophone 1 is at the critical distance and geophone 2 is at the crossover distance. You don't have to make your drawing perfectly to scale, but use a straight edge and label the critical angle, ic, everywhere that it occurs