a day has 24 hours
1 hour is 60 mins
1 min is 60 seconds
so a day has 24*60*60 seconds or 86400 seconds in it
how 300 inches per second so 300 times 86400=25920000 inches
therea re 5280ft or 12*5280 in or 63360 inches in a mile
so divide total inches travleed by number of inches per mile
25920000/63360=409.09090909090909090909090909091
about 409 miles