Last visit was: 25 Apr 2026, 09:41 It is currently 25 Apr 2026, 09:41
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
Sajjad1994
User avatar
GRE Forum Moderator
Joined: 02 Nov 2016
Last visit: 24 Apr 2026
Posts: 16,772
Own Kudos:
51,922
Given Kudos: 6,334
GPA: 3.62
Products:
GMAT Club Tests Forum Quiz
Posts: 16,772
Kudos: 51,922
A plane leaves Chicago at 6 A.M. and is scheduled to arrive in San Fra 04 Mar 2019, 14:23
Kudos
Add Kudos
Bookmarks
Bookmark this Post
00:00
Start Timer
Pause Timer
Resume Timer
Show Answer
Hide
Show
History
D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

5% (low)

Question Stats:

96% (01:27) correct 4% (01:35) wrong based on 127 sessions

History

Date
Time
Result
Not Attempted Yet
A plane leaves Chicago at 6 A.M. and is scheduled to arrive in San Francisco, 2,150 miles away, 4 hours later. For the first 2 hours of the trip, the pilot maintains an average speed of 450 miles per hour. If the flight is to arrive as scheduled, what must the plane’s average speed be, in miles per hour, for the next 2 hours?

A. 525
B. 550
C. 600
D. 625
E. 650
ShowHide Answer
Official Answer
D
avatar
thyagi
avatar
Joined: 19 Jan 2019
Last visit: 28 Dec 2020
Posts: 80
Own Kudos:
64
 [1]
Given Kudos: 8
GMAT 1: 650 Q49 V30
GMAT 1: 650 Q49 V30
Posts: 80
Kudos: 64
 [1]
A plane leaves Chicago at 6 A.M. and is scheduled to arrive in San Fra 04 Mar 2019, 20:22
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Total distance travelled in first 2 hours = 2*450 = 900 miles..
Distance left 2150-900 = 1250..
Time to reach San Francisco now = 2 hours..
Speed = 1250/2 = 625 mph.

Option D..

Posted from my mobile device
avatar
arjoyitaroy
avatar
Joined: 25 Nov 2018
Last visit: 27 Jun 2019
Posts: 1
Given Kudos: 25
Posts: 1
Kudos: 0
A plane leaves Chicago at 6 A.M. and is scheduled to arrive in San Fra 04 Mar 2019, 20:45
Kudos
Add Kudos
Bookmarks
Bookmark this Post
First 2 hours: say distance is x miles
s1 = x1/t1 => 450 = x1/2 => x1 = 900 miles
Remaining distance after first 2 hours = 2150-900 = 1250 miles
s2 = 1250/2 = 625 miles per hour (D)
User avatar
EgmatQuantExpert
User avatar
e-GMAT Representative
Joined: 04 Jan 2015
Last visit: 02 Apr 2024
Posts: 3,657
Own Kudos:
20,883
 [1]
Given Kudos: 165
Expert
Expert reply
Posts: 3,657
Kudos: 20,883
 [1]
A plane leaves Chicago at 6 A.M. and is scheduled to arrive in San Fra 04 Mar 2019, 22:28
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post

Solution



Given:
    • A plane leaves Chicago at 6 A.M. and is scheduled to arrive in San Francisco, 2,150 miles away, 4 hours later.
    • For the first 2 hours of the trip, the pilot maintains an average speed of 450 miles per hour.

To find:
    • If the flight is to arrive as scheduled, then the plane’s average speed, in miles per hour, for the next 2 hours.

Approach and Working:
Let us assume the average speed of the plane for the next 2 hours is v miles per hour.
    • Distance travelled in the first 2 hours = 450 x 2 = 900 miles
    • Distance travelled in the last 2 hours = v x 2 = 2v miles

As the total distance that needs to be covered is 2150 miles, we can say that
    • 900 + 2v = 2150
    Or, 2v = 2150 – 900 = 1250
    Or, v = 1250/2 = 625 miles per hour

Hence, the correct answer is option D.

Answer: D

User avatar
Archit3110
User avatar
Major Poster
Joined: 18 Aug 2017
Last visit: 25 Apr 2026
Posts: 8,630
Own Kudos:
5,190
 [1]
Given Kudos: 243
Status:You learn more from failure than from success.
Location: India
Concentration: Sustainability, Marketing
GMAT Focus 1: 545 Q79 V79 DI73
GMAT Focus 2: 645 Q83 V82 DI81
GPA: 4
WE:Marketing (Energy)
Products:
GMAT Club Tests Forum Quiz
GMAT Focus 2: 645 Q83 V82 DI81
Posts: 8,630
Kudos: 5,190
 [1]
A plane leaves Chicago at 6 A.M. and is scheduled to arrive in San Fra 06 Mar 2019, 03:03
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
SajjadAhmad
A plane leaves Chicago at 6 A.M. and is scheduled to arrive in San Francisco, 2,150 miles away, 4 hours later. For the first 2 hours of the trip, the pilot maintains an average speed of 450 miles per hour. If the flight is to arrive as scheduled, what must the plane’s average speed be, in miles per hour, for the next 2 hours?

A. 525
B. 550
C. 600
D. 625
E. 650
Show more


distance= 2150 miles
speed first 2 hrs = 450 mph
distance covered in 2 hrs = 2*450; 900 miles
distance left = 2150-900 ; 1250 miles
now time to destination 2 hrs
speed should be 1250/2 = 625 mph
IMO D
User avatar
ScottTargetTestPrep
User avatar
Target Test Prep Representative
Joined: 14 Oct 2015
Last visit: 25 Apr 2026
Posts: 22,286
Own Kudos:
26,536
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: 26,536
A plane leaves Chicago at 6 A.M. and is scheduled to arrive in San Fra 08 Mar 2019, 07:59
Kudos
Add Kudos
Bookmarks
Bookmark this Post
SajjadAhmad
A plane leaves Chicago at 6 A.M. and is scheduled to arrive in San Francisco, 2,150 miles away, 4 hours later. For the first 2 hours of the trip, the pilot maintains an average speed of 450 miles per hour. If the flight is to arrive as scheduled, what must the plane’s average speed be, in miles per hour, for the next 2 hours?

A. 525
B. 550
C. 600
D. 625
E. 650
Show more


We see that total time is 4 hours, and the total distance is 2150 miles.

After 2 hours, the plane has traveled 900 miles, so the plane must travel 2150 - 900 = 1250 miles for the next 2 hours, for an average speed of 1250/2 = 625 mph.

Answer: D
Moderators:
Bunuel
Math Expert
109827 posts
Krunaal
Tuck School Moderator
852 posts