Answer: 28.75
Step-by-step explanation: You honestly just need to divide each distance by 2 then add them together. First time it drops it goes down 10 meters. Then up five and back down. Then 2.5 meters then back down. Then 1.25, back down then .625 the back down.
At the end if you add together the total vertical distance you should get 28.75. If that is wrong well then the questions needs to be worded differently.