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Solution (in English) 

• Find out how long the trip will take from take off to landing. Store it in a variable called ‘tripLength’ 
• Find out when Mary and Louise are able to leave. Store it in a variable called ‘leaveTime’ 
• Calculate leaveTime plus tripLength. Store it in a variable called ‘minTime’
• Find out the available landing times. Store it in a variable called ‘availableTimes’ 
• Compare minTime to each availableTime 
• If availableTime is earlier than minTime, move to the next availableTime 
• if availableTime is equal to or later than minTime, book this time

Solution (flowchart)