GMAT Question of the Day: Daily via email | Daily via Instagram New to GMAT Club? Watch this Video

 It is currently 05 Jul 2020, 19:36

### 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

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

# Due to construction, the speed limit along an 8-mile section of highwa

Author Message
TAGS:

### Hide Tags

Intern
Joined: 03 Dec 2010
Posts: 30
Due to construction, the speed limit along an 8-mile section of highwa  [#permalink]

### Show Tags

07 Apr 2011, 05:46
3
11
00:00

Difficulty:

55% (hard)

Question Stats:

66% (02:29) correct 34% (02:21) wrong based on 285 sessions

### HideShow timer Statistics

Due to construction, the speed limit along an 8-mile section of highway is reduced from 55 miles per hour to 35 miles per hour. Approximately how many minutes more will it take to travel along this section of highway at the new speed limit than it would have taken at the old speed limit ?

(A) 5
(B) 8
(C) 10
(D) 15
(E) 24

PS21149
Director
Status: Impossible is not a fact. It's an opinion. It's a dare. Impossible is nothing.
Affiliations: University of Chicago Booth School of Business
Joined: 03 Feb 2011
Posts: 611
Re: Due to construction, the speed limit along an 8-mile section of highwa  [#permalink]

### Show Tags

Updated on: 07 Apr 2011, 06:03
Let t1 is time taken @ 55 mph
t1 = 8/55
Let t2 is time taken @ 35 mph
t2 = 8/35
Difference in time = 8/35 - 8/55 = 8 * 20 / (35 * 55) hr = 160 * 60 / (35 * 55) mins = 4.7 = 5 (approx) mins
Acer86 wrote:
Due to construction, the speed limit along an 8-mile section of highway is reduced from 55 miles per hour to 35 miles per hour. Approximately how many minutes more will it take to travel along this section of highway at the new speed limit than it would have taken at the old speed limit ?
(A) 5
(B) 8
(C) 10
(D) 15
(E) 24

Originally posted by gmat1220 on 07 Apr 2011, 05:59.
Last edited by gmat1220 on 07 Apr 2011, 06:03, edited 1 time in total.
Retired Moderator
Joined: 16 Nov 2010
Posts: 1163
Location: United States (IN)
Concentration: Strategy, Technology
Re: Due to construction, the speed limit along an 8-mile section of highwa  [#permalink]

### Show Tags

07 Apr 2011, 06:00
8/35 - 8/55 = 8/5 * ( 11 - 7)/77

= 8/5 * 4/77 * 60 min

= 8 * 12 * 4/77

= 384/77 ~ 4.9

_________________
Formula of Life -> Achievement/Potential = k * Happiness (where k is a constant)

GMAT Club Premium Membership - big benefits and savings
Retired Moderator
Joined: 20 Dec 2010
Posts: 1463
Re: Due to construction, the speed limit along an 8-mile section of highwa  [#permalink]

### Show Tags

07 Apr 2011, 06:03
Acer86 wrote:
Due to construction, the speed limit along an 8-mile section of highway is reduced from 55 miles per hour to 35 miles per hour. Approximately how many minutes more will it take to travel along this section of highway at the new speed limit than it would have taken at the old speed limit ?
(A) 5
(B) 8
(C) 10
(D) 15
(E) 24

Old time in minutes to cross 8 miles stretch = 8*60/55 = 8*12/11 = 96/11= 8.72
New time in minutes to cross 8 miles stretch = 8*60/35 = 8*12/7 = 13.71

Time difference = 13.71-8.72= 5

Ans: "A"
Director
Status: Impossible is not a fact. It's an opinion. It's a dare. Impossible is nothing.
Affiliations: University of Chicago Booth School of Business
Joined: 03 Feb 2011
Posts: 611
Re: Due to construction, the speed limit along an 8-mile section of highwa  [#permalink]

### Show Tags

07 Apr 2011, 06:55
I wondering if someone can use componendo / dividendo since t1/t2 is known. Hence average speed and average time can come into picture. Otherwise there is no takeaway from this problem.
Senior Manager
Joined: 01 Feb 2011
Posts: 490
Re: Due to construction, the speed limit along an 8-mile section of highwa  [#permalink]

### Show Tags

07 Apr 2011, 16:28
8/35 - 8/55 ~= 5

Manager
Joined: 14 Feb 2011
Posts: 136
Re: Due to construction, the speed limit along an 8-mile section of highwa  [#permalink]

### Show Tags

08 Apr 2011, 02:38
1
Acer86 wrote:
Due to construction, the speed limit along an 8-mile section of highway is reduced from 55 miles per hour to 35 miles per hour. Approximately how many minutes more will it take to travel along this section of highway at the new speed limit than it would have taken at the old speed limit ?
(A) 5
(B) 8
(C) 10
(D) 15
(E) 24

Since answer choices are fairly dispersed, we can use approximations here.

Difference is given by $$8*60/35 - 8*60/55$$

We can substitute 36 instead of 35 and 54 instead of 55 in expression above without sacrificing accuracy too much

We will get $$8*10/6-8*10/9 = 8*10*(1/6-1/9) = 8*10/18$$ ~4.5 ~5
Manager
Joined: 17 Jan 2011
Posts: 200
Re: Due to construction, the speed limit along an 8-mile section of highwa  [#permalink]

### Show Tags

08 Apr 2011, 19:00
=>55 x t1 = 35 x t2
=>t2 = 11/7 x t1
=> t2- t1 = 4/7 t1 = 4 x 8 / (7 x 55)
=> 1/16 (approx) hours
1/10 hrs is 6 mins, and 1/20 hr is 3 mins so 1/16 is around 4 and 5
Ans = A
_________________
Good Luck!!!

***Help and be helped!!!****
Director
Joined: 04 Aug 2010
Posts: 660
Schools: Dartmouth College
Re: Due to construction, the speed limit along an 8-mile section of highwa  [#permalink]

### Show Tags

27 Jun 2018, 03:20
1
Acer86 wrote:
Due to construction, the speed limit along an 8-mile section of highway is reduced from 55 miles per hour to 35 miles per hour. Approximately how many minutes more will it take to travel along this section of highway at the new speed limit than it would have taken at the old speed limit ?

(A) 5
(B) 8
(C) 10
(D) 15
(E) 24

Original time in minutes = $$\frac{d}{r} * 60 = \frac{8}{55} * 60 = \frac{8}{11} * 12 ≈ 9$$ minutes.

$$\frac{new-speed}{original-speed} = \frac{35}{55} = \frac{7}{11}$$
Since the rate and time have a reciprocal relationship:
$$\frac{new-time}{original-time} = \frac{11}{7} ≈ \frac{3}{2}$$

The resulting time ratio indicates that the new time is about 50% greater than the original time.
Thus:
Time increase in minutes ≈ 50% of 9 = 4.5.

_________________
GMAT and GRE Tutor
New York, NY

Available for tutoring in NYC and long-distance.
Non-Human User
Joined: 09 Sep 2013
Posts: 15378
Re: Due to construction, the speed limit along an 8-mile section of highwa  [#permalink]

### Show Tags

16 Sep 2019, 15:24
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
Non-Human User
Joined: 09 Sep 2013
Posts: 15378
Re: due to construction the speed limit along an 8 mile section  [#permalink]

### Show Tags

22 May 2020, 08:07
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
Re: due to construction the speed limit along an 8 mile section   [#permalink] 22 May 2020, 08:07