Answer:
48 km
Explanation:
The total distance = 4/4
12 km left = 3/4 of the way there
3/4 of the way there = 4/4 - 3/4 = 1/4 of the way left
12 km left = 1/4 of the way left
12 km = 1/4 of the way
multiply both sides by 4
48 km = 4/4 of the way = the total distance