Time to PSR     =  E x H                       Where  E = 7 hours 20 minutes (7.33hrs)

                             (O + H)                                   H = 385 kts

                                                                        O = 430 kts

                                                                        O + H = 815

 

Time to PSR  =  7.33 x 385    = 3.46 hours at 430 kts = 1,490 nm.          

                                    815