Answer :
We can just add all these numbers together because they are just addition and subtraction.
We assume the miner starts at 0 (the surface).
0 - 1200 (down) + 900 (up) - 350 (down) = -650 (C)
We assume the miner starts at 0 (the surface).
0 - 1200 (down) + 900 (up) - 350 (down) = -650 (C)