John and Ros are flying to Australia for a holiday. They must arrive at Gatwick Airport 2 hours before the flight takes off at 22:45. It takes 3 hours 50 minutes to reach the airport. What time must they leave home?
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Answer:
At 16:55 they should leave home
The flight takes off at 22:45
They have to arrive 2hours before i.e
at 22h45min -02h00min = at 20h45min
= at 20:45
Again they need 3hours 50minutes to the airport .
So, They have to leave home at
= 20h 45min - 3h 50min
= 16h 55min
=16:55
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