Lily took 6 hours to complete a journey at an average speed of 58km/h. For the first 4 hours, she travelled at an average speed of 64 km/h. What was the distance for the rest of the journey?

92km

Explanation:

According to this question, Lily took 6 hours to complete a journey at an average speed of 58km/h.

Using:

Speed (m/s) = distance (m) /time (s)

58 = d/6

d = 348km

The distance to complete the journey is 348km.

- For the first 4 hours, she travelled at an average speed of 64 km/h.

That is, 64 = d/4

d = 4 × 64

d = 256km

She travelled a distance of 256km in the first four hours.

Hence, the distance for the rest of the journey will be:

348km - 256km

= 92km

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