Two pints A and B on the surface of the earth are at the similar longitude and 60o apart in latitude assume that an earth quake at point A creates a P wave that reaches point B by traveling straight during the body of the earth at constant speed of 7.80 km / s the earth quake too radiates a Rayleigh wave which travels across the surface of the earth in an analogous way to a surface wave on water at 4.50 km / s (a) which of these two seismic waves arrives at B first (b) what is the time difference among the arrivals of the two waves at B take the radius of the earth to be 6370 km