Answer:
Step-by-step explanation:
We can think of this in two parts. What is the difference from the top of the mountain to sea level? Well it tells us hill is 120 2/3 feet ABOVE sea level. Similarly, the valley is 43 2/3 feet BELOW sea level. So this person went 120 2/3 down and then 43 2/3 further down. Can you handle it from there, or does something still not make sense?