Question

Ubehebe Crater in Death Valley has a diameter of a little more

Answer 1

First, we are going to use the formula of the circumference of a circle: $C=2 \pi r$
where 
$C$ is the circumference of the circle.
$r$ is the radius of the circle.

We know for our problem that the diameter of Ubehebe Crater is 1 mile. Since the radius of a circle is half its diameter, the radius of our crater will be: $r= \frac{1}{2} =0.5$. Lets replace that value in our formula:
$C=2 \pi r$
$C=2*3.14*0.5$
$C=3.14$ miles

Next, we are going to use the distance speed time formula: $t= \frac{d}{s}$
where
$t$ is time
$d$ is distance
$s$ is speed

We know for our problem that Latisha walks around its rim at a rate of 2 miles per hour, so her speed is 2 mph; therefore, $s=2$. We also know for our previous calculation that the circumference of the crater is 3.14 miles, so $d=3.14$. Lets replace those values in our formula to find $t$:
$t= \frac{d}{s}$
$t= \frac{3.14}{2}$
$t=1.6$ hours

We can conclude that it will take Latisha 1.6 hours to walk all the way around the crater.