A circular jogging track forms the edge of a circular lake

[Guest]

gmatprep-exam1
Could someone please help me with the following question/ Could you also provide an explanation along with the answer for future reference:
Thanks

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 CORRECT ANSWER
D. 2.5 < t < 3.0
E. 3 < t < 3.5

[Guest]

gmatprep-exam1
Could someone please help me with the following question/ Could you also provide an explanation along with the answer for future reference:
Thanks

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 CORRECT ANSWER
D. 2.5 < t < 3.0
E. 3 < t < 3.5

So the lake has a diameter of 3 miles. The circumference (PixD) of the lake is 3.14 x 2 = 6.28

Distance = Rate x Time

6.28Miles = 3Miles/Hour (T)

3T = 6.28

T= 2.09

Hope this helps

[Guest]

So the lake has a diameter of 2 miles!!!!! Sorry

[RonPurewal]

looks good.

[raghav2]

So the lake has a diameter of 2 miles!!!!! Sorry

The diameter is 2 and the radius is 1. I guess the guest did not write 1 as he was just multiplying

Circumference = 2*pi*r
i.e. 2 * 3.14 * 1 = 6.28

R x T = D
3 x T = 6.28

Hence T = 2.09

[jlucero]

I think the guest just used a different, equivalent formula:

C = pi*d
or
C = 2 * pi * r