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James walked 3 miles in 30 minutes today, if he doubles his pace tomor

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Bunuel
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James walked 3 miles in 30 minutes today, if he doubles his pace tomor [#permalink] New post   16 Mar 2017, 07:14
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James walked 3 miles in 30 minutes today, if he doubles his pace tomorrow how far will he walk in 15 minutes?

A. 1.5 miles
B. 3 miles
C. 4.5 miles
D. 6 miles
E. 9 miles
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B
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NandishSS
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Re: James walked 3 miles in 30 minutes today, if he doubles his pace tomor [#permalink] New post   16 Mar 2017, 07:39
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Bunuel wrote:
James walked 3 miles in 30 minutes today, if he doubles his pace tomorrow how far will he walk in 15 minutes?

A. 1.5 miles
B. 3 miles
C. 4.5 miles
D. 6 miles
E. 9 miles


Hi,

Think logically !!!

James walked 3 miles in 30 minutes today. If he doubles his pace tomorrow he would walk 6miles in 30 min.

However, the question is about 15 min so it is 3 miles

Hence B
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Re: James walked 3 miles in 30 minutes today, if he doubles his pace tomor [#permalink] New post   16 Mar 2017, 07:44
Bunuel wrote:
James walked 3 miles in 30 minutes today, if he doubles his pace tomorrow how far will he walk in 15 minutes?

A. 1.5 miles
B. 3 miles
C. 4.5 miles
D. 6 miles
E. 9 miles


Rate doubled means time halved..
thus for every miles covered in 30 minutes ,he will cover the same distance in 15minutes
=3miles

Ans B
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Re: James walked 3 miles in 30 minutes today, if he doubles his pace tomor [#permalink] New post   16 Mar 2017, 08:36
Bunuel wrote:
James walked 3 miles in 30 minutes today, if he doubles his pace tomorrow how far will he walk in 15 minutes?

A. 1.5 miles
B. 3 miles
C. 4.5 miles
D. 6 miles
E. 9 miles


Speed of 3miles in 30 minutes = Speed of 1.5 miles in 15 minutes

So, speed is 0.1 miles/minute

Quote:
He doubles his pace tomorrow how far will he walk in 15 minutes


Speed tomorrow will be 0.20 miles/minute...

Thus, the distance traveled will be 0.20*15 = 3 miles...

Hence, answer will be (B) 3 miles
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Re: James walked 3 miles in 30 minutes today, if he doubles his pace tomor [#permalink] New post   16 Mar 2017, 14:08
distance = speed x time
3 = 30 x x
x = 3/30 or 1/10

If speed double then speed is 1/5

15 x 1/5 = 3

Answer is B
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Re: James walked 3 miles in 30 minutes today, if he doubles his pace tomor [#permalink] New post   16 Mar 2017, 22:49
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Bunuel wrote:
James walked 3 miles in 30 minutes today, if he doubles his pace tomorrow how far will he walk in 15 minutes?

A. 1.5 miles
B. 3 miles
C. 4.5 miles
D. 6 miles
E. 9 miles


Speed doubles and Time halves

D = Speed * Time
New D = 2*Speed * Time/2 = Speed*Time = D

So new distance will still be 3 miles.
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Re: James walked 3 miles in 30 minutes today, if he doubles his pace tomor [#permalink] New post   17 Mar 2017, 00:55
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his current speed is 3/30 or 1/10
tomorrow his speed will be doubled to 2*1/10 or 1/5
so we will cover 3 miles
Rate * Time = Distance
1/5 * 15 = 3 miles ans
Therefore, B is the right choice
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Re: James walked 3 miles in 30 minutes today, if he doubles his pace tomor [#permalink] New post   17 Mar 2017, 01:22
3 miles = v *30 = 2v *30/2 = 2v*15

hence 3 miles

Option B
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Re: James walked 3 miles in 30 minutes today, if he doubles his pace tomor [#permalink] New post   18 Mar 2017, 20:03
an Easy question
Today
30 min = 3 miles
15 min = 3/2 miles.
Tomorrow (with double speed)
15 min = 3/2*2 = 3 miles
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Re: James walked 3 miles in 30 minutes today, if he doubles his pace tomor [#permalink] New post   22 Sep 2022, 04:47
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Re: James walked 3 miles in 30 minutes today, if he doubles his pace tomor [#permalink]
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