Time to PSR     =  E x H                       Where  E = 9 hours

                              (O + H)                                 H = 385 kts

                                                                            O = 435 kts

                                                                          O + H = 820

 

Time to PSR     =  9 x 385    = 4.226 hours at 435 kts = 1,838 nm.     

                                    820