He got to his place , from where he murdered her, sometime during that night. He may have caught the next tram after killing her, and continued his journey up to the cnr of Plenty Road and Grimshaw St, then walked about 2 klms down Grimshaw, nothing to a 20 yr old..
Or he could have bolted down Main Drive after killing her and cut across the golf course, and up to Greensborough Road, then to Grimshaw, this would have taken him a while, perhaps an hour, about 8 klms, maybe 10, and without his hat and shirt, not that he would have been conspicuous, it was a hot night.
All murderers start out from somewhere, and have to go back to somewhere, and sometimes they have plenty of time, and sometimes they don't. They can't stand around with their victim, they have to hot foot it off to somewhere, and usually, that is from where they came from. And summer nights are short, . from when he murdered her, he had about 5 hours of dark and an hour of sunrise. ( Sunrise for Melbourne that morning was 6.16am)