Distance to PET  =   D x H                   where   D = 2,484nm

                                     (O + H)                               H = 500 kts

                                                                                  O = 420 kts

                                                                            O + H  = 920

 

Distance to PET  =  2,484 x 500          = 1,350 nm at 420 kts = 193 minutes.

                                         920