Last visit was: 26 Apr 2026, 00:32 It is currently 26 Apr 2026, 00:32
Home
Messages
Tests
Schools
Events
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: 26 Apr 2026
Posts: 109,832
Own Kudos:
811,317
 [5]
Given Kudos: 105,889
Products:
GMAT Club Tests Forum Quiz
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 109,832
Kudos: 811,317
 [5]
Stan drove for h hours at a constant rate of r miles per hour. How man 19 Jul 2018, 23:44
1
Kudos
Add Kudos
4
Bookmarks
Bookmark this Post
00:00
Start Timer
Pause Timer
Resume Timer
Show Answer
Hide
Show
History
E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

45% (medium)

Question Stats:

64% (01:29) correct 36% (01:25) wrong based on 286 sessions

History

Date
Time
Result
Not Attempted Yet
Stan drove for h hours at a constant rate of r miles per hour. How many miles did he go during the final 20 minutes of his drive?

A. 20r
B. hr/3
C. 3rh
D. hr/20
E. r/3
ShowHide Answer
Official Answer
E
User avatar
GMATbuster92
User avatar
Joined: 28 Jun 2018
Last visit: 20 Jul 2019
Posts: 147
Own Kudos:
343
 [1]
Given Kudos: 32
Location: India
Concentration: Finance, Marketing
Schools: CUHK '21 (II)
GMAT 1: 650 Q49 V30
GPA: 4
Products:
My Reviews
Schools: CUHK '21 (II)
GMAT 1: 650 Q49 V30
Posts: 147
Kudos: 343
 [1]
Stan drove for h hours at a constant rate of r miles per hour. How man 19 Jul 2018, 23:50
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
if speed is constant , it does not matter what distance you travel in first 20 min or last 20 min , it will be same

so hr /60 * 20 = hr/3
User avatar
sudarshan22
User avatar
Retired Moderator
Joined: 30 Jan 2015
Last visit: 10 Nov 2019
Posts: 628
Own Kudos:
2,477
 [1]
Given Kudos: 1,131
Location: India
Concentration: Operations, Marketing
GPA: 3.5
Posts: 628
Kudos: 2,477
 [1]
Stan drove for h hours at a constant rate of r miles per hour. How man 20 Jul 2018, 02:04
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
Stan drove for h hours at a constant rate of r miles per hour. How many miles did he go during the final 20 minutes of his drive?

A. 20r
B. hr/3
C. 3rh
D. hr/20
E. r/3
Show more

+1 for E.

Distance (D) = Speed (S) * Time (T)
S * T = r*20/60 mins = r / 3

Hence, E.
User avatar
yoannnesme
User avatar
Joined: 17 May 2018
Last visit: 25 Nov 2022
Posts: 65
Own Kudos:
106
 [1]
Given Kudos: 26
Expert
Expert reply
Posts: 65
Kudos: 106
 [1]
Stan drove for h hours at a constant rate of r miles per hour. How man 20 Jul 2018, 03:32
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
20 minutes is one third of one hour.

If Stan travels r miles every hour, then he will travel one third of r miles in one third of an hour, or r/3 in 20 minutes.
User avatar
gracie
User avatar
Joined: 07 Dec 2014
Last visit: 11 Oct 2020
Posts: 1,028
Own Kudos:
2,023
Given Kudos: 27
Posts: 1,028
Kudos: 2,023
Stan drove for h hours at a constant rate of r miles per hour. How man 22 Jul 2018, 20:56
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
Stan drove for h hours at a constant rate of r miles per hour. How many miles did he go during the final 20 minutes of his drive?

A. 20r
B. hr/3
C. 3rh
D. hr/20
E. r/3
Show more

r[h-(h-1)]/3=r/3
E
User avatar
ScottTargetTestPrep
User avatar
Target Test Prep Representative
Joined: 14 Oct 2015
Last visit: 25 Apr 2026
Posts: 22,286
Own Kudos:
26,537
Given Kudos: 302
Status:Founder & CEO
Affiliations: Target Test Prep
Location: United States (CA)
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 22,286
Kudos: 26,537
Stan drove for h hours at a constant rate of r miles per hour. How man 23 Jul 2018, 18:29
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
Stan drove for h hours at a constant rate of r miles per hour. How many miles did he go during the final 20 minutes of his drive?

A. 20r
B. hr/3
C. 3rh
D. hr/20
E. r/3
Show more

We use the formula: distance = rate x time. Since 20 minutes = ⅓ hours, Stan went r x 1/3 = r/3 miles.

Answer: E
User avatar
bumpbot
User avatar
Non-Human User
Joined: 09 Sep 2013
Last visit: 04 Jan 2021
Posts: 38,987
Own Kudos:
1,118
Posts: 38,987
Kudos: 1,118
Stan drove for h hours at a constant rate of r miles per hour. How man 22 Mar 2024, 03:33
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Automated notice from GMAT Club BumpBot:

A member just gave Kudos to this thread, showing it’s still useful. I’ve bumped it to the top so more people can benefit. Feel free to add your own questions or solutions.

This post was generated automatically.
Moderators:
Bunuel
Math Expert
109831 posts
Krunaal
Tuck School Moderator
852 posts