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Charles walked 3 miles in 30 minutes today. If he doubles his pace to

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Charles walked 3 miles in 30 minutes today. If he doubles his pace to [#permalink]

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New post 13 Mar 2017, 07:02
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Charles walked 3 miles in 30 minutes today. If he doubles his pace tomorrow how far will he walk in 1 hour?

A. 1 mile
B. 3 miles
C. 6 miles
D. 12 miles
E. 24 miles
[Reveal] Spoiler: OA

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Re: Charles walked 3 miles in 30 minutes today. If he doubles his pace to [#permalink]

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New post 13 Mar 2017, 08:10
Charles walked 3 miles in 30 minutes today

If he doubles his speed, then he will walk 6 miles in 30 mins and 12 miles in 60 mins (1hr)

Answer is D. 12 miles
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Re: Charles walked 3 miles in 30 minutes today. If he doubles his pace to [#permalink]

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New post 13 Mar 2017, 08:54
Bunuel wrote:
Charles walked 3 miles in 30 minutes today. If he doubles his pace tomorrow how far will he walk in 1 hour?

A. 1 mile
B. 3 miles
C. 6 miles
D. 12 miles
E. 24 miles


Quote:
Charles walked 3 miles in 30 minutes today.


Today's speed = 6 miles/hour

Quote:
If he doubles his pace tomorrow how far will he walk in 1 hour?


So, Tomorrow's speed will be 12 miles/hour, answer must be (D)
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Re: Charles walked 3 miles in 30 minutes today. If he doubles his pace to [#permalink]

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New post 14 Mar 2017, 13:06
distance = speed x time
3 = x x 30
3/30 = x
x = 1/10

If he doubles his speed then x is equal 1/5

1/5 x 60 = 12. Answer is D
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Re: Charles walked 3 miles in 30 minutes today. If he doubles his pace to [#permalink]

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New post 18 Mar 2017, 19:21
30 min = 3 miles
60 min = 6 miles,

With double the speed, He can travel 12 Miles ( = 2 * 6 miles) in one hour
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Re: Charles walked 3 miles in 30 minutes today. If he doubles his pace to [#permalink]

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New post 20 Mar 2017, 05:53
Bunuel wrote:
Charles walked 3 miles in 30 minutes today. If he doubles his pace tomorrow how far will he walk in 1 hour?

A. 1 mile
B. 3 miles
C. 6 miles
D. 12 miles
E. 24 miles


The rate of Charles today is 3/30 = 1/10. If he doubles his pace, his new rate would be 2 x (1/10) = 2/10 = 1/5.

Since distance = rate x time, and 1 hour = 60 minutes, he can walk 1/5 x 60 = 12 miles.

Alternate Solution:

If Chris walked 3 miles in 30 minutes today, that also means that today his rate was 6 miles in one hour. If he doubles this rate tomorrow, then he will be able to walk 12 miles in one hour.

Answer: D
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Re: Charles walked 3 miles in 30 minutes today. If he doubles his pace to [#permalink]

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New post 21 Mar 2017, 03:15
Bunuel wrote:
Charles walked 3 miles in 30 minutes today. If he doubles his pace tomorrow how far will he walk in 1 hour?

A. 1 mile
B. 3 miles
C. 6 miles
D. 12 miles
E. 24 miles


speed = 3/30 = 0.1 miles/min
new speed = 0.2 miles/min
therefore in 60 minutes, he will travel = 0.2*60 = 12 miles
Re: Charles walked 3 miles in 30 minutes today. If he doubles his pace to   [#permalink] 21 Mar 2017, 03:15
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