Translation:The man runs ten kilometers a day.
"Each day" which was the previous issue was corrected 5 days ago. But here I think we have something else. We accept .... ten kilometers/ten kilometres/10 kilometers/10 kilometres. We don't accept "km" which I think is what you used. I'm contacting Duo to see which abbreviations are automatically accepted...I'll get back to you.
Thanks for bringing it to our attention.