Question

Ubehebe crater in Death Vally has a diameter of a little more than 1/2 mile. If latisha walks around its 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 pi

Answer 1

$l=2 \pi r$
r=0.25 miles
l=2×$\pi$×0.25
 =0.5 × 3.14
 =1.57

120(minutes)÷2(miles)=60(minutes per mile)
60×1.57=94.2 minutes