PSR & PET

What is the distance to the point of safe endurance if an aircraft has a TAS of 300 knots and a safe endurance of 10 hours, if the wind component on the outbound leg is 50 knots headwind?

What is the time to the point of safe return (PSR) if the distance from A to B is 2368 nautical miles, the outbound groundspeed in 365 knots, the homebound groundspeed is 480 knots, and safe endurance is 8 hours 30 minutes?

What is the distance from 'Q' to the point of safe return (PSR) for an aircraft that was over 'Q' at 1320 hours flying direct to 'R', given the following data? Distance 'Q' TO 'R' 3016 nm, True airspeed 480 kt, safe endurance 10 hours, if the mean wind Component 'outbound' -90 kt, and the mean wind component 'homebound' is +75 kt.