if it took an average man 15 mins to walk 1 mile , then he stopped for a break for 30 seconds then walked half a mile back then stopped for a further 30 seconds and returned to the end point of his original journey , how long has it took him to walk the half mile back ?
smartypants you only asked for the time it took to walk half mile back, not the whole journey, or including stops.
Plus he seems to have gone half way back only to turn around again!
smartypants,
why don't you give us your answer and see if any of us can work out how you arrived at it, because your question and subsequent comments collectively make no sense whatsoever