Dist = 2484 nm
gs (out) = 420kt
gs (home) = 500kt
End = 8h 30min = 8.5hours
Time to psr= E*H /O+H = 8.5*500 / 420+500 = 4250/920 = 4.619
Dist to psr= Time * Gs (out) = 4.619 * 420= 1940nm