Last visit was: 25 Apr 2026, 07:22 It is currently 25 Apr 2026, 07:22
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
haardiksharma
User avatar
Joined: 17 May 2017
Last visit: 23 Jun 2025
Posts: 103
Own Kudos:
820
 [14]
Given Kudos: 246
GPA: 3
Products:
My Reviews
Posts: 103
Kudos: 820
 [14]
Tom drove from X to Y and then from Y to X and took different routes b 03 Jul 2017, 03:31
1
Kudos
Add Kudos
13
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:

35% (medium)

Question Stats:

69% (01:46) correct 31% (01:55) wrong based on 444 sessions

History

Date
Time
Result
Not Attempted Yet
Tom drove from X to Y and then from Y to X and took different routes back and forth. It took him 40 miles per hour to move from X to Y. Meanwhile, it took him 50 miles per hour to come from Y to X. What was the average speed for his entire travel?

1) The distance from the return trip was 4/5 of the entire distance.
2) The distance from the return trip was 160 miles.
ShowHide Answer
Official Answer
A
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 25 Apr 2026
Posts: 109,827
Own Kudos:
811,197
 [3]
Given Kudos: 105,878
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: 109,827
Kudos: 811,197
 [3]
Tom drove from X to Y and then from Y to X and took different routes b 03 Jul 2017, 03:59
3
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Tom drove from X to Y and then from Y to X and took different routes back and forth. It took him 40 miles per hour to move from X to Y. Meanwhile, it took him 50 miles per hour to come from Y to X. What was the average speed for his entire travel?

\(Average \ speed = \frac{(Total \ distance)}{(Total \ time)}\)

(1) The distance from the return trip was 4/5 of the entire distance. Say the entire distance is d, then the distance from Y to X is 4d/5 and the distance from X to Y is d/5.

\(Average \ speed = \frac{(Total \ distance)}{(Total \ time)}=\frac{d}{\frac{(\frac{d}{5})}{40}+\frac{(\frac{4d}{5})}{50}}=\frac{1}{\frac{(\frac{1}{5})}{40}+\frac{(\frac{4}{5})}{50}}\) (by reducing d). Sufficient.


(2) The distance from the return trip was 160 miles. Not sufficient.

Answer: A.

Hope it's clear.
avatar
Tom drove from X to Y and then from Y to X and took different routes b 01 Aug 2018, 06:54
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
Tom drove from X to Y and then from Y to X and took different routes back and forth. It took him 40 miles per hour to move from X to Y. Meanwhile, it took him 50 miles per hour to come from Y to X. What was the average speed for his entire travel?

\(Average \ speed = \frac{(Total \ distance)}{(Total \ time)}\)

(1) The distance from the return trip was 4/5 of the entire distance. Say the entire distance is d, then the distance from Y to X is 4d/5 and the distance from X to Y is d/5.

\(Average \ speed = \frac{(Total \ distance)}{(Total \ time)}=\frac{d}{\frac{(\frac{d}{5})}{40}+\frac{(\frac{4d}{5})}{50}}=\frac{1}{\frac{(\frac{1}{5})}{40}+\frac{(\frac{4}{5})}{50}}\) (by reducing d). Sufficient.


(2) The distance from the return trip was 160 miles. Not sufficient.

Answer: A.

Hope it's clear.
Show more

Hello, I was wondering about this part - "the distance from Y to X is 4d/5 and the distance from X to Y is d/5."

I understood why the distance from Y to X is 4d/5, but how did we conclude that the distance from X to Y is d/5?

Posted from my mobile device
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 25 Apr 2026
Posts: 109,827
Own Kudos:
811,197
Given Kudos: 105,878
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: 109,827
Kudos: 811,197
Tom drove from X to Y and then from Y to X and took different routes b 01 Aug 2018, 07:05
Kudos
Add Kudos
Bookmarks
Bookmark this Post
vedanths
Bunuel
Tom drove from X to Y and then from Y to X and took different routes back and forth. It took him 40 miles per hour to move from X to Y. Meanwhile, it took him 50 miles per hour to come from Y to X. What was the average speed for his entire travel?

\(Average \ speed = \frac{(Total \ distance)}{(Total \ time)}\)

(1) The distance from the return trip was 4/5 of the entire distance. Say the entire distance is d, then the distance from Y to X is 4d/5 and the distance from X to Y is d/5.

\(Average \ speed = \frac{(Total \ distance)}{(Total \ time)}=\frac{d}{\frac{(\frac{d}{5})}{40}+\frac{(\frac{4d}{5})}{50}}=\frac{1}{\frac{(\frac{1}{5})}{40}+\frac{(\frac{4}{5})}{50}}\) (by reducing d). Sufficient.


(2) The distance from the return trip was 160 miles. Not sufficient.

Answer: A.

Hope it's clear.

Hello, I was wondering about this part - "the distance from Y to X is 4d/5 and the distance from X to Y is d/5."

I understood why the distance from Y to X is 4d/5, but how did we conclude that the distance from X to Y is d/5?

Posted from my mobile device
Show more

(1) The distance from the return trip was 4/5 of the entire distance.

So, if the total distance is d, then the distance from Y yo X is 4/5*d and the distance from X to Y is d - 4/5*d = d/5.
User avatar
bumpbot
User avatar
Non-Human User
Joined: 09 Sep 2013
Last visit: 04 Jan 2021
Posts: 38,984
Own Kudos:
1,117
Posts: 38,984
Kudos: 1,117
Tom drove from X to Y and then from Y to X and took different routes b 14 Sep 2025, 17:01
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
109827 posts
kingbucky
498 posts
Gmat860sanskar
212 posts