Question

Ubehebe crater in Death Valley has a diameter of a little more than 1/2 mile. If latisha walks around it's rim at a rate of 2 miles per hour, about how long will it take her to walk all the way around the crater? Find your answer to the nearest tenth. Use 3.14 for pie

Answer 1

Let's say that the diameter was 1/2 mile. So the diameter is 1/2, then you need to find the circumference, aka perimeter of the circle. So 1/2 times 3.14 = 1.57 miles So then you would do 1.57/2 = .785 of an hour If you round to nearest tenth The answer is .8 of an hour.

Answer 2

It took Latisha 0.8 hour to walk all the way around the crater

Explanation:

Firstly, we write the parameters which we were given in the question

diameter (d) = 1/2 or 0.5 mile, velocity (v) = 2 miles per hour, π = 3.14

circumference of a circle (C) = 2πr

But 2 x radius ⇒ diameter, hence,

circumference of a circle = πd ⇒ 3.14 x 0.5 = 1.57 miles

C = 1.57 miles

Therefore, the circumference of the crater is 1.57 miles

To calculate how long it will take her to walk all the way around the crater, divide the distance (circumference of the crater) by speed (velocity). Mathematically represented as:

t = C ÷ v

t = 1.57 ÷ 2 = 0.785 hour

t = 0.8 hour (to the nearest tenth)

It took Latisha 0.8 hour (or 48 minutes) to walk all the way around the crater