Answer:
What is the question being asked? (140?)
Step-by-step explanation:
I'm going to assume it is total distance walked. Soooo
50 -> 10 = 40.
Then 10 -> 40 = 30.
Then 40 -> 0 = 40.
0 -> 30 = 30.
40+30+40+30=140
It would not let me comment, but otherwise I would have asked haha