Task: Reasoning / Round Up Error
User instruction:
The current time is 8:30 PM. I have booked a flight from London Heathrow Airport to LA International Airport at 12:00 AM. Assuming I can board the plane immediately upon arrival at London Heathrow Airport, what should be the minimum speed in kilometers per hour to reach London Heathrow Airport on time, given that the distance from my current location to London Heathrow Airport is 269.5km? Provide the final answer in the format "Answer: XXX" as a single rounded up integer after considering the steps.

Evaluation criteria:
The correct answer is 77.
The response must follow the format "Answer: 77".