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If Sam is running on a circular track of radius 25 meters, with a spee

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Bunuel
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If Sam is running on a circular track of radius 25 meters, with a spee [#permalink] New post   02 Sep 2018, 22:05
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If Sam is running on a circular track of radius 25 meters, with a speed of 5 meters per second, how long will it take him to run 1.6 laps?


A. \(6\pi\)

B. \(8\pi\)

C. \(16\pi\)

D. \(25\pi\)

E. \(80\pi\)
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Re: If Sam is running on a circular track of radius 25 meters, with a spee [#permalink] New post   03 Sep 2018, 00:35
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Bunuel wrote:
If Sam is running on a circular track of radius 25 meters, with a speed of 5 meters per second, how long will it take him to run 1.6 laps?


A. \(6\pi\)

B. \(8\pi\)

C. \(16\pi\)

D. \(25\pi\)

E. \(80\pi\)
Imho, answer is C
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If Sam is running on a circular track of radius 25 meters, with a spee [#permalink] New post   03 Sep 2018, 01:22
Bunuel wrote:
If Sam is running on a circular track of radius 25 meters, with a speed of 5 meters per second, how long will it take him to run 1.6 laps?


A. \(6\pi\)

B. \(8\pi\)

C. \(16\pi\)

D. \(25\pi\)

E. \(80\pi\)



distance = 1.6 ( circumfrence ) = 1.6(2*pi*25) = \(80\pi\)
time = \(80\pi\) /5 = \(16\pi\)
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Re: If Sam is running on a circular track of radius 25 meters, with a spee [#permalink] New post   11 Sep 2018, 17:15
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Bunuel wrote:
If Sam is running on a circular track of radius 25 meters, with a speed of 5 meters per second, how long will it take him to run 1.6 laps?


A. \(6\pi\)

B. \(8\pi\)

C. \(16\pi\)

D. \(25\pi\)

E. \(80\pi\)


The circumference of the track is 50π, so 1.6 laps is 1.6 x 50π = 80π.

We’ll use the formula distance/rate = time to calculate the time it will take him to run 1.6 laps. Thus, it will take him 80π/5 = 16π seconds.

Answer: C
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Re: If Sam is running on a circular track of radius 25 meters, with a spee [#permalink]
11 Sep 2018, 17:15
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