3. The graph shows a hill walker's trek. She stopped for a rest at 12:00 and for lunch at 13:00. 11:00 11:30 12:00 12:30 13:00 13:30 14:00 14:30 Time a) Without carrying out any calculations, state the times between which she was walking fastest. Explain your answer. b) For how long did she walk before she first stopped for rest? c) How far did she walk during this time? d) What was her average speed after her rest but before she stopped for lunch? Distance (km)

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