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

Question

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

0akshay0 · Answer

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-)

matthewsmith_89 · Answer

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

KrishnakumarKA1 · Answer

speed = 3/30 = 0.1 miles/minute

time taken for 4.5 miles = 4.5/0.1 = 45 minutes = 0.75hrs

EMPOWERgmatRichC · Answer

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:  C

GMAT assassins aren't born, they're made,
Rich

JeffTargetTestPrep · Answer

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

asfandabid · Answer

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

ehsan090 · Answer

Bunuel 
This is a very easy question I think it it is of less than 500 difficulty level. Am I right?

bumpbot · Answer

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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.

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