Question

If the mid-Atlantic Ocean is spreading at 2.6 cm per year, how many years has it taken for it to reach its present width of about 5000 km?

Answer 1

Answer:

192307692 years

Step-by-step explanation:

Let's convert the 5000 km to cm for relatively easier computations.

1 m = 100 cm

1 km = 1000 m = 100000 cm

5000 km = 500000000 cm

If 2.6 cm is equivalent to 1 year, then 5 km is equivalent to $\frac{500000000}{2.6} = 192307692$ years

Answer 2

Answer:

192,307,692 year

Step-by-step explanation:

To find the time it takes for the Atlantic Ocean to expand 5,000 km it is enough to apply the rule of three, but not before placing the data they provide in the same units

Knowing that 1km = 100000 cm, and that in a year the Atlantic Ocean expands 2.6 cm , so

1km → 100.000 cm then 5.000km how many cm there?

$\frac{5.000km*100.000cm}{km}=500000000cm =5*10^{8}cm$, then if one year the atlantic ocean spreading at 2.6 cm so for $5*10^{8}$ how long?

$x=\frac{5*10^{8}\frac{cm}{year}}{2.6cm}=192.307.692 year$

It can also be resolved

$\frac{5.000km}{2.6cm.year}*100.000cm=192,307,692$