Young's modulus for earth can be approximated by 5.5*10^5 MN/m^2 and the corresponding shear modulus by 2.0*10^5 MN/m^2. A first signal of an earthquake arrives at a detection station at t= 0 min, and a second signal arrives 2.0 min later. Assume the succesive signals are those of longitudinal waves and shear waves, respectively, that follow the same straight-line path through the planet. Assume further that the average density of Earth 5.5g/cm^3. How far from the station did the earthquake take place?