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Stumbled upon this question and thought I'd get some clarification in here.
Q: An aircraft is scheduled to depart aerodrome XX at 1200 UTC for aerodrome YY, which requires an alternate. Flight time to the destination YY is 1hr and 15mins and the flight time to the alternate ZZ is 40mins. If the aerodrome forecast for ZZ expires at 1500 UTC, the latest time the aircraft can depart XX is:
A. 1205 UTC
B. 1255 UTC
C. 1305 UTC
D. 1405 UTC
Answer is A. The answers quote an AIP reference of ENR 1.10 1.2.5 which is: '......a pilot must ensure forecasts are valid for a period of not less than 30mins before and 60mins after the planned ETA....'
If someone could kindly show working and explain why the answer is A it would be greatly appreciated.