Ok so I am thinking 10kph to do 5k in half hour but I find this speed is too much. I have been studying the runs today and have just completed run 1 of week five but see my third run this week is for 20 mins without a break. I just don't know if I am ready for that yet. I am currenly jogging at 7.5kph on treadmill - is that fast enough? I am definitely seeing some progression though..