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John walks 3 miles in 30 minutes, how long will it take him to walk 4.

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John walks 3 miles in 30 minutes, how long will it take him to walk 4. [#permalink]

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New post 20 Mar 2017, 04:37
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

75% (00:38) correct 25% (00:21) wrong based on 80 sessions

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Re: John walks 3 miles in 30 minutes, how long will it take him to walk 4. [#permalink]

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New post 20 Mar 2017, 05:14
Bunuel wrote:
John walks 3 miles in 30 minutes, how long will it take him to walk 4.5 miles?

A. 0.25 hours
B. 0.45 hours
C. 0.75 hours
D. 1.5 hours
E. 4.5 hours


3 miles in 30 minutes
let 4.5 miles be covered in x mins

30/3 = x/4.5
x = 10*4.5 = 45 mins = 3/4 hours = 0.75 hours

Hence option C is correct
Hit Kudos if you liked it 8-)
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Re: John walks 3 miles in 30 minutes, how long will it take him to walk 4. [#permalink]

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New post 20 Mar 2017, 11:46
distance = speed x time
3 = speed x 30
speed = 3/30

distance = speed x time
4.5 = 3/30 x time
time = 45 minutes which is equivalent to 0.75 hours which is answer C
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Re: John walks 3 miles in 30 minutes, how long will it take him to walk 4. [#permalink]

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New post 21 Mar 2017, 03:40
Bunuel wrote:
John walks 3 miles in 30 minutes, how long will it take him to walk 4.5 miles?

A. 0.25 hours
B. 0.45 hours
C. 0.75 hours
D. 1.5 hours
E. 4.5 hours



speed = 3/30 = 0.1 miles/minute

time taken for 4.5 miles = 4.5/0.1 = 45 minutes = 0.75hrs
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Re: John walks 3 miles in 30 minutes, how long will it take him to walk 4. [#permalink]

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New post 21 Mar 2017, 20:09
1
Hi All,

Since this is essentially just a rate question, you can approach the 'math' in a variety of ways. If you have a pacing issue with any section of the GMAT though, simply getting a question correct is NOT the only goal - you have to think about whether you're approaching the prompt in the most efficient way possible or not.

It's worth noting that nothing on the GMAT is ever random - thus, the specific wording of the prompt, and the numbers involved, might provide you with a 'shortcut' in terms of how to approach the question.

Here, we're told that it takes John 30 minutes to walk 3 miles. We're then asked how long it would take John to walk 4.5 miles. Notice how 4.5 miles is exactly 50% greater then 3 miles... that means that the time it takes to walk that distance is 50% greater too...

(30 minutes)(1.5) = 45 minutes

Final Answer:

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Re: John walks 3 miles in 30 minutes, how long will it take him to walk 4. [#permalink]

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New post 22 Mar 2017, 09:38
Bunuel wrote:
John walks 3 miles in 30 minutes, how long will it take him to walk 4.5 miles?

A. 0.25 hours
B. 0.45 hours
C. 0.75 hours
D. 1.5 hours
E. 4.5 hours


Since John can walk 3 miles in 30 minutes he can walk 3 miles in 1/2 hour. Thus, his rate is 3/(1/2) = 6 mph.

Thus, it will take him 4.5/6 = 45/60 = 3/4 = 0.75 hours to walk 4.5 miles.

Answer: C
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Re: John walks 3 miles in 30 minutes, how long will it take him to walk 4. [#permalink]

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New post 24 Mar 2017, 10:58
Given:
3 miles-30 mins
Let x= minutes needed to walk 4.5 miles
4.5 miles- x mins
3/4.5=30/x
x=(30/3)*4.5
x= 45 mins
which is equal to
45mins/60mins= 0.75 Hours.

Hence C is the correct answer.
Bunuel, please let me know if this is the correct approach
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Re: John walks 3 miles in 30 minutes, how long will it take him to walk 4. [#permalink]

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New post 25 Mar 2017, 10:15
Bunuel
This is a very easy question I think it it is of less than 500 difficulty level. Am I right?
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Re: John walks 3 miles in 30 minutes, how long will it take him to walk 4.   [#permalink] 25 Mar 2017, 10:15
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John walks 3 miles in 30 minutes, how long will it take him to walk 4.

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