Last visit was: 24 Apr 2026, 20:23 It is currently 24 Apr 2026, 20:23
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.
Close
Request Expert Reply
Confirm Cancel
User avatar
Thelegend2631
Joined: 04 May 2020
Last visit: 18 Nov 2025
Posts: 371
Own Kudos:
314
 [13]
Given Kudos: 308
Status:What goes round comes around, so does Kudos.
Location: India
GPA: 3
WE:Business Development (Retail Banking)
1
Kudos
Add Kudos
12
Bookmarks
Bookmark this Post
User avatar
chetan2u
User avatar
GMAT Expert
Joined: 02 Aug 2009
Last visit: 24 Apr 2026
Posts: 11,229
Own Kudos:
45,009
 [3]
Given Kudos: 335
Status:Math and DI Expert
Location: India
Concentration: Human Resources, General Management
GMAT Focus 1: 735 Q90 V89 DI81
Products:
Expert
Expert reply
GMAT Focus 1: 735 Q90 V89 DI81
Posts: 11,229
Kudos: 45,009
 [3]
2
Kudos
Add Kudos
1
Bookmarks
Bookmark this Post
avatar
Abhay099
Joined: 27 Apr 2021
Last visit: 03 Oct 2021
Posts: 5
Given Kudos: 58
Posts: 5
Kudos: 0
Kudos
Add Kudos
Bookmarks
Bookmark this Post
User avatar
chetan2u
User avatar
GMAT Expert
Joined: 02 Aug 2009
Last visit: 24 Apr 2026
Posts: 11,229
Own Kudos:
Given Kudos: 335
Status:Math and DI Expert
Location: India
Concentration: Human Resources, General Management
GMAT Focus 1: 735 Q90 V89 DI81
Products:
Expert
Expert reply
GMAT Focus 1: 735 Q90 V89 DI81
Posts: 11,229
Kudos: 45,009
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Abhay099
hD13
A flight starts from Delhi at 9:00 am local time and reaches Dubai at 1 am local time. The same flight starts from Dubai at 3pm local time and reaches Delhi at 3 am local time. If the flight undertook both the journies at the same speed, find the time difference between Dubai and Delhi ?

A. 1.5 Hours
B. 2 Hours
C. 3 Hours
D. 2.5 Hours
E. 3.5

Posted from my mobile device


explain. the time difference comes 4 hours......so we divide it by 2 for A TRIP that's why 2 hours? is this reasoning correct?


Yes, that is correct and the algebraic approach of x hours difference uses the same logic.
avatar
adhya9
Joined: 30 Nov 2020
Last visit: 10 Nov 2022
Posts: 11
Own Kudos:
9
 [2]
Given Kudos: 183
Posts: 11
Kudos: 9
 [2]
2
Kudos
Add Kudos
Bookmarks
Bookmark this Post
hD13
A flight starts from Delhi at 9:00 am local time and reaches Dubai at 1 am local time. The same flight starts from Dubai at 3pm local time and reaches Delhi at 3 am local time. If the flight undertook both the journies at the same speed, find the time difference between Dubai and Delhi ?

A. 1.5 Hours
B. 2 Hours
C. 3 Hours
D. 2.5 Hours
E. 3.5

Posted from my mobile device

Ignore time difference and calculate the journey period
Delhi -> Dubai = 9am to 1 am = 16 hours
Dubai -> Delhi = 3pm to 3am = 12 hours

Say Delhi is 'X' hours ahead of Dubai
Delhi -> Dubai = 9am to 1 am = 16 hours = 16+x
Dubai -> Delhi = 3pm to 3am = 12 hours = 12-x

Given: Distance and speed is similar => Times are equal
16+x = 12-x
x = -2

Thus, Delhi is 2 hours behind Dubai
User avatar
MathRevolution
User avatar
Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Last visit: 27 Sep 2022
Posts: 10,063
Own Kudos:
Given Kudos: 4
GMAT 1: 760 Q51 V42
GPA: 3.82
Expert
Expert reply
GMAT 1: 760 Q51 V42
Posts: 10,063
Kudos: 20,001
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Delhi to Dubai: 9:00 am - 1 am = 16 hours

Dubai to Delhi: 3:00 pm - 3 am = 12 hours

The overall difference between both journeys is 4 hours. So, it should be 2 hours time difference between the two places.

Answer B
User avatar
kkannan2
Joined: 20 Feb 2022
Last visit: 12 Aug 2024
Posts: 26
Own Kudos:
Given Kudos: 10
Location: United States
Posts: 26
Kudos: 10
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Hi chetan2u, I'm struggling a bit with the verbal translation here.

We have "A flight starts from Delhi at 9:00 am local time and reaches Dubai at 1 am local time. The same flight starts from Dubai at 3pm local time and reaches Delhi at 3 am local time."

Does this mean that a flight starts from Delhi at 9 am local time in Delhi and reaches Dubai at 1 am local time in Dubai and the same flight starts from Dubai at 3 pm local time in Dubai and reaches Delhi at 3 am local time in Delhi? It's a bit ambiguous to me whether the 1 am local time is in Delhi time or in Dubai time and same for the 3 am local time. I'm thinking I have it right, but just wanted to confirm.

Also, I'm not really following how you get that the flight takes off from Delhi at 9 am + x hrs and lands at 3 am + x hrs. Can you please elaborate on that?
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 24 Apr 2026
Posts: 109,818
Own Kudos:
Given Kudos: 105,873
Products:
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 109,818
Kudos: 811,088
Kudos
Add Kudos
Bookmarks
Bookmark this Post
kkannan2
A flight starts from Delhi at 9:00 am local time and reaches Dubai at 1 am local time. The same flight starts from Dubai at 3pm local time and reaches Delhi at 3 am local time. If the flight undertook both the journies at the same speed, find the time difference between Dubai and Delhi ?

A. 1.5 Hours
B. 2 Hours
C. 3 Hours
D. 2.5 Hours
E. 3.5

Hi chetan2u, I'm struggling a bit with the verbal translation here.

We have "A flight starts from Delhi at 9:00 am local time and reaches Dubai at 1 am local time. The same flight starts from Dubai at 3pm local time and reaches Delhi at 3 am local time."

Does this mean that a flight starts from Delhi at 9 am local time in Delhi and reaches Dubai at 1 am local time in Dubai and the same flight starts from Dubai at 3 pm local time in Dubai and reaches Delhi at 3 am local time in Delhi? It's a bit ambiguous to me whether the 1 am local time is in Delhi time or in Dubai time and same for the 3 am local time. I'm thinking I have it right, but just wanted to confirm.

Also, I'm not really following how you get that the flight takes off from Delhi at 9 am + x hrs and lands at 3 am + x hrs. Can you please elaborate on that?
­
From Delhi to Dubai: The flight departs from Delhi at 9:00 AM (Delhi local time) and arrives in Dubai at 1:00 AM (Dubai local time).
From Dubai to Delhi: The flight departs from Dubai at 3:00 PM (Dubai local time) and arrives back in Delhi at 3:00 AM (Delhi local time).­

Delhi to Dubai: From 9 AM to 1 AM = 16 hours.
Dubai to Delhi: From 3 PM to 3 AM = 12 hours.
Assume Delhi is 'x' hours ahead of Dubai:

Delhi to Dubai: 9 AM to 1 AM = 16 hours = 16 - x.
Dubai to Delhi: 3 PM to 3 AM = 12 hours = 12 + x.
The travel times should be equal, thus 16 - x = 12 + x, which gives x = 2.

Answer: B.­
User avatar
bumpbot
User avatar
Non-Human User
Joined: 09 Sep 2013
Last visit: 04 Jan 2021
Posts: 38,976
Own Kudos:
Posts: 38,976
Kudos: 1,117
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:
Math Expert
109818 posts
Tuck School Moderator
853 posts