Fran swims at a speed of 2.62.6 km/h in still water. The Lazy River flows at a speed of 0.30.3 km/h. How long will it take Fran to swim 88 km upstream? 88 km downstream?

Fran's upstream time =  37.93 hrs

Fran's downstream time =  30.13 hrs

Explanation:

given data

speed in still water = 2.62 km/h

River flows = 0.3 km/h

Fran to swim upstream =  88 km

solution

we will apply here distance formula that is

distance  = speed  × time   ...................1

put here value

so here

Fran's upstream speed = 2.62 km/h - 0.3 km/h  = 2.32 km/h

Fran's downstream speed = 2.62 km/h + 0.3 km/h = 2.92 km/h  

so

Fran's upstream time =  = 37.93 hrs

Fran's downstream time = = 30.13 hrs

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