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Estimate how many days it would take to walk around the world, assuming 12 h walking per day at 4 km/h. assume that the oceans are crossed in the same manner as the land. the radius of earth is 6.38 Ã 103 km.

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Yna9141
The circumference of the Earth is calculated through the equation,
       C = 2πr
where C is the circumference and r is the radius. 

Substituting the given to the equation,
          C = 2π(6.38 x 10³)
          C = 12760π km

We determine the number of hours that needs to be spent in order to walk around the calculated circumference. This can be calculated through the equation.
              t = distance / speed
Substituting the known values,
              t = (12760π km) / (4 km/h)
                t = 3190π hours

Then, we calculate for the number of days given that only 12 hours is spent per day for the walk.
       number of days = (3190π hours) / (12 hours/day)
          number of days = 835.14 days

ANSWER: 635.14 days

Answer:836 days

Step-by-step explanation:

Given

radius of earth is [tex]6.38\times 10^3 km[/tex]

Walking speed 4 km/h

walking 12 hour a day

perimeter of earth is [tex]2\pi r[/tex]

Time taken [tex]=\frac{2\pi r}{4}=10,022.98 hr[/tex]

therefore it requires [tex]\frac{10,022.98}{12}=835.24 \approx 836days[/tex]

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