Kimberly77 wrote:
BrentGMATPrepNow wrote:
novice12 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
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/speed
So, Johanna's travel time = (pi)(2)miles /3mph ≈ 6.28/3 ≈ 2.1 hours
Answer:C
HiBrentGMATPrepNow , Question state "Johanna walked once around the track " I understand it as one whole circle so used pi* r^2 to calculate and still arrive at the correct answer. Is there anything wrong with the reasoning as compared to using circumference? ThanksBrent
You definitely shouldnot use the area of a circle formula for this question.
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Statistics : Posted by BrentGMATPrepNow • on 18 Oct 2015, 08:41 • Replies 20 • Views 59199
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