What is 6cm into inches

What we have to work with. We change the fractions to decimals. 3/4=0.75  1/2 = 0.5 1/4= 0.25

2miles + 1.75miles = 3.75miles(path there)
3.75miles - 0.5miles = 3.25miles (path back) 
(you would divide 7 miles (3.75miles + 3.25miles = 7miles) by how many hikers there are to figure out how many miles each hiker has hiked since I don't know how many hikers there are)

3.75miles + 3.25miles = 7miles
7miles/0.25miles = 28 gallons
28 gallons of water that the hikers bring (you would divide this by how many hikers there are to figure out how many gallons each hiker has since I don't know how many hikers there are)

Path there = 3.75
Path back = 3.25
Gallons of water = 28 gallons

Hope this helps. :)