Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized for You

we will pick new questions that match your level based on your Timer History

Track Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

Timothy leaves home for school, riding his bicycle [#permalink]

Show Tags

02 Sep 2012, 14:59

1

This post received KUDOS

8

This post was BOOKMARKED

00:00

A

B

C

D

E

Difficulty:

35% (medium)

Question Stats:

69% (03:07) correct
31% (02:00) wrong based on 302 sessions

HideShow timer Statistics

Timothy leaves home for school, riding his bicycle at a rate of 9 miles per hour. Fifteen minutes after he leaves, his mother sees Timothy’s math homework lying on his bed and immediately leaves home to bring it to him. If his mother drives at 36 miles per hour, how far (in terms of miles) must she drive before she reaches Timothy?

A) 1/3 B) 3 C) 4 D) 9 E) 12

I think is a 700 level problem but I tag it as 600/700, let me know. Either way I hope in an explanation Thanks

Sometimes these types of Combined Rate/Chase-Down questions can be really complicated, but this one is not so bad. You can actually solve it with some logic and a little bit of math (and avoid the longer calculation-heavy approach).

Based on what we're told in the prompt, we know that Timothy travels on his own at 9mph for 15 minutes. Since 15 minutes = 1/4 of an hour, Timothy traveled 2.25 miles before his Mom gets in the car to chase him down.

Since the Mom drives 36mph and Timothy is only going 9mph, she is traveling 4 TIMES FASTER than he is. In basic terms, this means that for every 1 mile Timothy travels, his Mom travels 4 miles.

So, if Timothy DID travel another 1 mile, he'd have traveled 2.25 + 1 = 3.25 miles while his Mom would have driven 4 miles (and gone past him). This means that his Mom caught him at some point between 2.25 miles and 3.25 miles. There's only one answer that 'fits'....

Re: Timothy leaves home for school, riding his bicycle [#permalink]

Show Tags

02 Sep 2012, 19:41

1

This post received KUDOS

1

This post was BOOKMARKED

Timothy leaves home for school, riding his bicycle at a rate of 9 miles per hour. Fifteen minutes after he leaves, his mother sees Timothy’s math homework lying on his bed and immediately leaves home to bring it to him. If his mother drives at 36 miles per hour, how far (in terms of miles) must she drive before she reaches Timothy?

A) 1/3

B) 3

C) 4

D) 9

E) 12

Suppose Timothy's mom meets him after time 't'

Then distance traveled by his mom = distance traveled by him in (15mins) + distance traveled by him in time 't'

=> 36 * t = 9 *(15/60) + 9*t => t = (1/12) hrs

Distance traveled = 36 * t = 36 * (1/12) miles = 3miles

So, Answer will be B

And am not sure about the tag but i guess 600-700 is fine.

Timothy leaves home for school, riding his bicycle at a rate of 9 miles per hour. Fifteen minutes after he leaves, his mother sees Timothy’s math homework lying on his bed and immediately leaves home to bring it to him. If his mother drives at 36 miles per hour, how far (in terms of miles) must she drive before she reaches Timothy?

A) 1/3 B) 3 C) 4 D) 9 E) 12

I think is a 700 level problem but I tag it as 600/700, let me know. Either way I hope in an explanation Thanks

Distance Timothy covers in 15 mins i.e. 1/4 hours = Rate*Time = 9/4 miles Time taken by mom to meet him = Distance/Relative Speed = (9/4)/(36 - 9) = 1/12 hours Distance traveled by mom in this time = 36 * (1/12) = 3 miles
_________________

Re: Timothy leaves home for school, riding his bicycle [#permalink]

Show Tags

23 Aug 2014, 19:51

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________

In Time, Speed and Distance problems, it's a good idea to draw a rough diagram to visualize the given information.

Let the distance between the Home and the Point of Meeting be D miles. The question asks us to find the value of D.

As per the question, Timothy's mother left home 15 minutes after he did. But they both reached the Point of Meeting at the same time.

This means,

(Time taken by Timothy's mother to cover D miles) = (Time taken by Timothy to cover D miles) - (15 minutes)

Now, \(Time = \frac{Distance}{Speed}\)

So, the above equation becomes:

\(\frac{D}{36} = \frac{D}{9} - \frac{15}{60}\)

Upon solving this, we get, D = 3 miles

One important point to be careful of in Distance and Speed questions is: Use the same units for a particular quantity throughout the question. By this I mean, if the speed is expressed in miles per hour and travel time/ difference between time taken by 2 people is given in minutes, then you must remember to either convert the time from minutes to hours or convert the speed from miles per hours to miles per minutes. Throughout the question, you should use only one unit for time.

Re: Timothy leaves home for school, riding his bicycle [#permalink]

Show Tags

13 May 2016, 03:39

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________

Re: Timothy leaves home for school, riding his bicycle [#permalink]

Show Tags

30 Jun 2016, 21:09

carcass wrote:

Timothy leaves home for school, riding his bicycle at a rate of 9 miles per hour. Fifteen minutes after he leaves, his mother sees Timothy’s math homework lying on his bed and immediately leaves home to bring it to him. If his mother drives at 36 miles per hour, how far (in terms of miles) must she drive before she reaches Timothy?

A) 1/3 B) 3 C) 4 D) 9 E) 12

I think is a 700 level problem but I tag it as 600/700, let me know. Either way I hope in an explanation Thanks

In 15 mins, Timothy travels=9/4 miles. Now, let his mother takes x hours to reach him, traveling at 36mph. So, 36x=9x+9/4 x=1/12 hrs. Thus, the distance traveled by his mother to reach= 36*1/12=3 miles. Ans B

Re: Timothy leaves home for school, riding his bicycle [#permalink]

Show Tags

04 Dec 2016, 20:35

carcass wrote:

Timothy leaves home for school, riding his bicycle at a rate of 9 miles per hour. Fifteen minutes after he leaves, his mother sees Timothy’s math homework lying on his bed and immediately leaves home to bring it to him. If his mother drives at 36 miles per hour, how far (in terms of miles) must she drive before she reaches Timothy?

A) 1/3 B) 3 C) 4 D) 9 E) 12

I think is a 700 level problem but I tag it as 600/700, let me know. Either way I hope in an explanation Thanks

This is an 600-700 level question.

\(15minutes = \frac{15}{60}hour=\frac{1}{4}hour\)

When Timothy's mother starts driving, Timothy has traveled: \(\frac{1}{4}\times 9=\frac{9}{4}miles\)

Now, Timothy's speed is 9 miles/hour and Timothy's mother's speed is 36 miles/hour, hence Timothy's mother travels faster than Timothy \(36-9=27\) miles each hour.

At the first time, Timothy's mother is 9/4 miles far away from Timothy.

Hence, the time that Timothy's mother needs to catch up Timothy is: \(\frac{\frac{9}{4}}{36-9}=\frac{\frac{9}{4}}{27} =\frac{1}{12} hour\)

This means Timothy's mother must drive: \(\frac{1}{12}\times 36=3 miles\)

Campus visits play a crucial role in the MBA application process. It’s one thing to be passionate about one school but another to actually visit the campus, talk...

Its been long time coming. I have always been passionate about poetry. It’s my way of expressing my feelings and emotions. And i feel a person can convey...

Marty Cagan is founding partner of the Silicon Valley Product Group, a consulting firm that helps companies with their product strategy. Prior to that he held product roles at...

Written by Scottish historian Niall Ferguson , the book is subtitled “A Financial History of the World”. There is also a long documentary of the same name that the...