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
