Answer:
The plane can go up-to 2.8 miles.
Explanation:
Troposphere is the lowest layer of the earth's atmosphere.
This layer varies from different locations and the season.
A plane is flying at an altitude of 5.8 miles.
The troposphere layer is 8.6 miles deep in that area so remaining altitude up-to which the plane can go will be (8.6 - 5.8) = 2.8 miles.
Therefore, plane can go up by 2.8 miles more.