Problem of the Week due by Wednesday 11/27 (optional)

Julia Child was roasting a turkey.  It has been out of the oven for 20 minutes.  The turkey was roasting for 4 hours 15 minutes.  The oven was pre-heated for 10 minutes (before she put in the turkey).  If it is 5:00 now, then what time did Julia put the turkey in the oven?  Show work or explain your strategy.