Mark, Jodie and Sue A should all be around the same pace and likely to come in around 1:05:00. I think you have the potential to be quicker than that but I think a good strategy would be to stick with Mark (he’s very strong and consistent up the hills) until you reach the main road, then perhaps look to kick on a bit if feeling strong.
That long climb is a real grind so having others around you can make a massive difference.