Carcass wrote:
A circular jogging track forms the edge of a circular lake that has a diameter of 2 miles. Johanna walked once around the track at the average speed of 3 miles per hour. If t represents the number of hours it took Johanna to walk completely around the lake, which of the following is a correct statement?
A. 0.5< t < 0.75
B. 1.75< t < 2.0
C. 2.0 < t < 2.5
D. 2.5 < t < 3.0
E. 3 < t < 3.5
Circumference of a circle = (pi)(diameter)So, the distance around the circular lake =
(pi)(2) miles.
Travel time = distance/speedSo, Johanna's travel time =
(pi)(2) miles/3 mph ≈ 6.28/3 ≈ 2.1 hours
Answer: C