math question 3

carlisle              12 miles                 brampton             6 hours
banks                8 miles                   gilsland                4 hours
gilsland              2 miles                   bush nook           1 hour
army museum    6 miles                   milecastle inn       3 hours
milecastle inn     7 miles                   housesteads        3.5 hours
vindolanda         1.5 miles               once brewed       .5 hours

1.=12/6=2mph
2.=8/4=2mph
3.=6/3=2mph
4.=7/3.5=2mph
5.=2/1=2mph
6.=1/.5=3mph

2+2+2+2+3+2=13/6=2.15

2.15mph average