Chapter 1, Problem 46GP

Solution

The number of days a person would take to move around the world.

  $t=1001.66\text{days}$

Given:

A person walks 10 hour per day at the rate of 4km/h

Formula used:

  $t=\frac{d}{v}$ here t is time, d is distance and v is velocityCalculation:

Radius of Earth is $6.38\times {10}^3\text{km}$

The circumference of Earth is

  $\begin{array}{c}C=2\times 3.14\times 6.38\times {10}^3\\ =40066.4\text{km}\end{array}$

The person walks 10 hour per day at the rate of 4 km/hour. This means person walks 40 km/day

From the formula $t=\frac{d}{v}$

  $\begin{array}{c}t=\frac{40066.4}{40}\\ =1001.66\text{days}\end{array}$

Conclusion:

Therefore, a person will take 1001.66 days to walk around the world.