The answer is: 891 meters
Step-by-step explanation:
First add Rosalva's distances = 1.5 + 0.69 + 1.04 + 2.1 = 5.33 km = 5.33 * 1000 m = 5330 meters
Second add Jake's distances = 1450 + 1590 + 1204 + 1977 = 6221 meters
Now take the difference Jake's and Rosalva's four day distances: 6221 - 5330 = 891 meters