Because that is how far they were able to travel in a day.
The time difference is 2 hours 30 mins and the mile range is 170 miles.
@ 4.5 miles
@ 4.5 miles
It is 30-15 = 15
30 miles
About 30 miles.
about 30 miles
round about 20-30 miles.
About 30 miles
30 miles
30 miles
between 30 and 50 miles