Events & Promotions
|
|
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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Nov 2007:30 AM PST
-08:30 AM PST
Learn what truly sets the UC Riverside MBA apart and how it helps in your professional growth
Nov 2211:00 AM IST
-01:00 PM IST
Do RC/MSR passages scare you? e-GMAT is conducting a masterclass to help you learn – Learn effective reading strategies Tackle difficult RC & MSR with confidence Excel in timed test environment- Nov 23
11:00 AM IST
-01:00 PM IST
Attend this free GMAT Algebra Webinar and learn how to master the most challenging Inequalities and Absolute Value problems with ease. 
Nov 2510:00 AM EST
-11:00 AM EST
Prefer video-based learning? The Target Test Prep OnDemand course is a one-of-a-kind video masterclass featuring 400 hours of lecture-style teaching by Scott Woodbury-Stewart, founder of Target Test Prep and one of the most accomplished GMAT instructors.
26 Jul 2010, 22:46
Kudos
Bookmarks
B
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:
69% (02:08) correct
31%
(01:51)
wrong
based on 1573
sessions
History
Date
Time
Result
Not Attempted Yet
A car travels from point A to point B. The average speed of the car is 60 miles/hr and it travels the first half of the trip at a speed of 90 mi/hr. What is the speed of the car in the second half of the trip?
A. 30
B. 45
C. 60
D. 75
E. 90
A. 30
B. 45
C. 60
D. 75
E. 90
26 Jul 2010, 23:08
Kudos
Bookmarks
A car travels from point A to point B. The average speed of the car is 60 miles/hr and it travels the first half of the trip at a speed of 90 mi/hr. What is the speed of the car in the second half of the trip?
A. 30
B. 45
C. 60
D. 75
E. 90
Let the average speed for the second half of the trip be \(x\) miles per hour.
Pick some smart number for the distance from A to B: let the distance be 180 miles, so half of the distance will be 90 miles.
\(Average \ speed=\frac{total \ distance}{total \ time}\) --> \(60=\frac{180}{total \ time}\);
Total time equals time for the first half plus time for the second half --> \(\frac{90}{90}+\frac{90}{x}=\frac{x+90}{x}\);
So \(60=\frac{180}{total \ time}\) --> \(60=\frac{180x}{x+90}\) --> \(60x+60*90=180x\) --> \(120x=60*90\) --> \(x=45\).
Answer: B.
A. 30
B. 45
C. 60
D. 75
E. 90
Let the average speed for the second half of the trip be \(x\) miles per hour.
Pick some smart number for the distance from A to B: let the distance be 180 miles, so half of the distance will be 90 miles.
\(Average \ speed=\frac{total \ distance}{total \ time}\) --> \(60=\frac{180}{total \ time}\);
Total time equals time for the first half plus time for the second half --> \(\frac{90}{90}+\frac{90}{x}=\frac{x+90}{x}\);
So \(60=\frac{180}{total \ time}\) --> \(60=\frac{180x}{x+90}\) --> \(60x+60*90=180x\) --> \(120x=60*90\) --> \(x=45\).
Answer: B.
26 Jun 2014, 03:27
Kudos
Bookmarks
Let total distance = 2x
Avg Speed = 60
For first half
Distance = x
Speed = 90
For second Half
Distance =x
Speed = s (Assume)
Setting up the equation
\(\frac{x}{90} + \frac{x}{s} = \frac{2x}{60}\)
s = 45
Answer = B
Avg Speed = 60
For first half
Distance = x
Speed = 90
For second Half
Distance =x
Speed = s (Assume)
Setting up the equation
\(\frac{x}{90} + \frac{x}{s} = \frac{2x}{60}\)
s = 45
Answer = B
