The average marathon is 42 km long. if the average person can run the marathon with an average velocity of 2.57 m/s, how long will it take to finish the race

16,342seconds

Explanation:

Average velocity is defined as the rate of change in displacement of a body. Mathematically,

Average velocity = Displacement/Time

Given average distance a person can run = 42km = displacement

Average velocity = 2.57m/s

Substituting the values in the formula to get the time;

Time = Displacement/velocity

42km to metres = 42000m

Time = 42000/2.57

Time = 16,342seconds

It will take approximately 16,342seconds to finish the race

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