What does the second law of thermodynamics state? A. No heat engine can convert all the heat input into usable work energy.
B. Entropy of systems in nature always decreases as they run.
C. Matter cannot be created or destroyed; it can only change forms.
D. Energy cannot be created or destroyed; it can only change forms.

i think the answer is B.

Explanation:

this is poiselle's equation from fluid mechanic in physics. mech eng

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day