Last visit was: 15 Dec 2024, 13:33 It is currently 15 Dec 2024, 13:33
Home
GMAT
Messages
Tests
Schools
Reviews
Social
Chat
My Profile
Close
GMAT Club Daily Prep
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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel
Back to Forum
Create Topic
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 15 Dec 2024
Posts: 97,886
Own Kudos:
686,169
Given Kudos: 88,273
Products:
GMAT Club Tests Forum Quiz
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 97,886
Kudos: 686,169
Joan walks 4 feet per second, which is half as fast as Al walks. If B 29 Mar 2017, 05:07
Kudos
Add Kudos
Bookmarks
Bookmark this Post
00:00
Start Timer
Pause Timer
Resume Timer
Show Answer
Hide
Show
History
A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

15% (low)

Question Stats:

83% (00:55) correct 17% (00:51) wrong based on 139 sessions

History

Date
Time
Result
Not Attempted Yet
Joan walks 4 feet per second, which is half as fast as Al walks. If Bob is twice as fast as Al then how far will Bob walk in a minute?

A. 960 feet
B. 480 feet
C. 240 feet
D. 60 feet
E. 16 feet
ShowHide Answer
Official Answer
A
User avatar
pushpitkc
User avatar
Joined: 26 Feb 2016
Last visit: 24 Apr 2024
Posts: 2,856
Own Kudos:
5,590
Given Kudos: 47
Location: India
GPA: 3.12
Posts: 2,856
Kudos: 5,590
Joan walks 4 feet per second, which is half as fast as Al walks. If B 29 Mar 2017, 06:42
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Joan walks at half the speed of Al. Hence, Al walks at twice the speed(8 ft/s) Since bob walks twice as fast as al. Al's speed will be 16 ft/s or 960 ft/minute (Option A)

Sent from my LG-H818 using GMAT Club Forum mobile app
User avatar
0akshay0
User avatar
Joined: 19 Apr 2016
Last visit: 14 Jul 2019
Posts: 203
Own Kudos:
584
Given Kudos: 59
Location: India
Schools: Jindal '20 Kelley '20 Broad '20 Carey '20 Mays '20
GMAT 1: 570 Q48 V22
GMAT 2: 640 Q49 V28
GPA: 3.5
WE:Web Development (Computer Software)
Schools: Jindal '20 Kelley '20 Broad '20 Carey '20 Mays '20
GMAT 2: 640 Q49 V28
Posts: 203
Kudos: 584
Joan walks 4 feet per second, which is half as fast as Al walks. If B 29 Mar 2017, 10:33
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
Joan walks 4 feet per second, which is half as fast as Al walks. If Bob is twice as fast as Al then how far will Bob walk in a minute?

A. 960 feet
B. 480 feet
C. 240 feet
D. 60 feet
E. 16 feet

Bob = 2 Al = 2 Joan
Al = 2*4 =8
Bob = 2*8=16 feet/min

Bob will walk 16*60 = 960 feet in a minute

Hence option A is correct
Hit Kudos if you liked it 8-)
avatar
matthewsmith_89
avatar
Joined: 06 Dec 2016
Last visit: 06 Oct 2017
Posts: 195
Own Kudos:
61
Given Kudos: 10
Posts: 195
Kudos: 61
Joan walks 4 feet per second, which is half as fast as Al walks. If B 29 Mar 2017, 14:05
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Joan 4
Al 8
Bob 16

Bob = 60 x 16 = 960 Answer A
User avatar
JeffTargetTestPrep
User avatar
Target Test Prep Representative
Joined: 04 Mar 2011
Last visit: 05 Jan 2024
Posts: 3,023
Own Kudos:
7,220
Given Kudos: 1,646
Status:Head GMAT Instructor
Affiliations: Target Test Prep
Expert reply
Posts: 3,023
Kudos: 7,220
Joan walks 4 feet per second, which is half as fast as Al walks. If B 31 Mar 2017, 12:36
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
Joan walks 4 feet per second, which is half as fast as Al walks. If Bob is twice as fast as Al then how far will Bob walk in a minute?

A. 960 feet
B. 480 feet
C. 240 feet
D. 60 feet
E. 16 feet

Since Joan’s rate is 4 feet per second and her rate is half of Al’s rate, Al’s rate is 8 feet per second. Since Bob’s rate is twice as fast as Al’s, his rate is 16 feet per second.

Finally, since 1 minute = 60 seconds, Bob will walk 16 x 60 = 960 feet in a minute.

Answer: A
User avatar
EgmatQuantExpert
User avatar
e-GMAT Representative
Joined: 04 Jan 2015
Last visit: 02 Apr 2024
Posts: 3,696
Own Kudos:
18,314
Given Kudos: 165
Expert reply
Posts: 3,696
Kudos: 18,314
Joan walks 4 feet per second, which is half as fast as Al walks. If B 31 Mar 2017, 14:02
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
Joan walks 4 feet per second, which is half as fast as Al walks. If Bob is twice as fast as Al then how far will Bob walk in a minute?

A. 960 feet
B. 480 feet
C. 240 feet
D. 60 feet
E. 16 feet

Solution



    • Joan walks at 4 feet per second.

    • Joan walks half as fast as Al, which means,

      o Joan \(= \frac{(Al)}{2}\)

      o \(Al = 8\) feet per second.

    • Bob walks twice as fast as Al, which means,

      o \(Bob = 2*Al\)

      o \(Bob = 2* 8 = 16\) feet per second.

    • Distance traveled by Bob in a minute(60 seconds) \(= Speed * Time = 16 * 60 = 960\) feet.

    • Thus, correct answer is Option A.


Thanks,
Saquib
Quant Expert
e-GMAT

Aiming to score Q50 or higher in GMAT Quant? Attend this webinar on 2nd April to learn a structured approach to solve 700+ Number Properties question in less than 2 minutes. Register

avatar
ehsan090
avatar
Joined: 08 Oct 2016
Last visit: 16 Feb 2018
Posts: 183
Own Kudos:
39
Given Kudos: 76
Location: United States
Concentration: General Management, Finance
GPA: 2.9
WE:Engineering (Telecommunications)
Posts: 183
Kudos: 39
Joan walks 4 feet per second, which is half as fast as Al walks. If B 21 Apr 2017, 23:31
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
Joan walks 4 feet per second, which is half as fast as Al walks. If Bob is twice as fast as Al then how far will Bob walk in a minute?

A. 960 feet
B. 480 feet
C. 240 feet
D. 60 feet
E. 16 feet

Option:A
Time taken:0:59
Joan=4 ft/sec
Al=2*Joan
Bob=2*Al
Therefore
Al=8 ft/sec
Bob=16 ft/sec
(Please read the question carefully may be you trapped by option E here)
for finding per minute spreed of Bob
Bob=16*60=960 ft/min
User avatar
generis
User avatar
Senior SC Moderator
Joined: 22 May 2016
Last visit: 18 Jun 2022
Posts: 5,316
Own Kudos:
36,322
Given Kudos: 9,464
Products:
GMAT Club Tests
Expert reply
Posts: 5,316
Kudos: 36,322
Joan walks 4 feet per second, which is half as fast as Al walks. If B 26 Apr 2017, 14:36
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
Joan walks 4 feet per second, which is half as fast as Al walks. If Bob is twice as fast as Al then how far will Bob walk in a minute?

A. 960 feet
B. 480 feet
C. 240 feet
D. 60 feet
E. 16 feet

When there is just one conversion, here, from seconds to minutes, I find it faster to convert before calculating.

Joan is half as fast as Al => Al is twice as fast as Joan, and Bob is twice as fast as Al.

Start with Joan, convert her rate, multiply by 2, then multiply by 2 again.

Joan = \(\frac{4 ft}{1 sec}\) x \(\frac{60}{60}\) = \(\frac{240 ft}{60 secs}\) = \(\frac{240 ft}{1 min}\), times 2 =>

Al = \(\frac{480 ft}{1 min}\), times 2 =>

Bob = \(\frac{960 ft}{1 min}\) Answer A.
Moderator:
Bunuel
Math Expert
97886 posts