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i got 6.40. i just let t = t-1 for the harbour entrance, since whatever is happening at the wharf is just happening at the harbour entrance an hour earlier, and then set y =6 since the tide has to be greater than 6. The tide will already be greater than 6 since it starts at a high tide at 2am...

I'd say the raw mark for e4 would be about 70/84 to be honest. it was hard but not too hard, marks of mid 70's were very easily attainable.