Cira has ran 6/4 of a mile which is 1 1/2 mile.
She still has 2/3rd to go so she has ran 1/3.
Therefore for every 1/3 of the trail equal 1 1/2 mile.
so 1/3 + 1/3 +1 /3 equal the whole trail
then 1 1/2 + 1 1/2 +1 1/2= 4 1/2 miles
The trail is 4.5 or 4 1/2 miles long
