John (an off-duty fireman) tries to assist a passenger on a train, Doris to exit, but as Doris is not wearing her glasses, she misjudges the distance and falls breaking her hip a) Does Rail Corp owe a duty of care to Doris? If so, why? b) Does John owe a duty of care to Doris? If so, why? c) Are there any cases that assist your answer?

I need typed answer with explanation