i did it even slower than you.
i did the walking sections at 5km/hr except as it went on i ended up spending half of the walking times down at 4.5 km/hr.
the jogging sections i did mainly at 8km/hr (8km/hr = 5mph), but dropped down to 7 or 7.5 km/hr for parts of it.
the last jog i thought lets go for it and cranked it up to 10km/hr, where i stayed for only a few seconds before going down to 9, then 8 again lol.
but - i did keep going even though after 15 mins i was like i cant finish all of this, and after 20 mins i was like i definitely cant do all this! hopefully i will be able to go tomorrow for day 2s workout. (but only if i am up early enough to go before work!). slightly achey today so good i had today off.
going to set myself a target of doing all the jogs at 8km/hr and all the walks at 5km/hr before i move onto week 2 i think!