The journey of MS .B Should travel by train to Brighton because the trip by train to take just 30 minutes from Gatwick station and if the land from London Victoria Station will take longer than 1 hours so the journey of MS. B Should travel by train from Gatwick railway station because the journey takes just 30 minutes and before you go every time should be check schedule the train every time to reach your destination on time and in the lunch as Ms.B want to.