V1 = 7.5L
P1= 100.0 kPa
v2=11L
P2=
solve for P2

Formula =   P1V1 = P2V2

                   7.5 x 100000 = p2 X 11

                   750000 / 11 = P2

                      P2 = 68181.81 Pa

                                  or

                            =  68.18181 kPa

Explanation:

newton's first law of motion

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