GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 16 Oct 2019, 22:24 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

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.  A certain bridge is 4,024 feet long. Approximately how many minutes...

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:

Hide Tags

Current Student B
Status: Persevere
Joined: 09 Jan 2016
Posts: 117
Location: Hong Kong
GMAT 1: 750 Q50 V41 GPA: 3.52
A certain bridge is 4,024 feet long. Approximately how many minutes...  [#permalink]

Show Tags

4
42 00:00

Difficulty:   25% (medium)

Question Stats: 78% (02:19) correct 22% (02:24) wrong based on 1105 sessions

HideShow timer Statistics

A certain bridge is 4,024 feet long. Approximately how many minutes does it take to cross this bridge at a constant speed of 20 miles per hour? (1 mile = 5,280 feet)

(A) 1
(B) 2
(C) 4
(D) 6
(E) 7
EMPOWERgmat Instructor V
Status: GMAT Assassin/Co-Founder
Affiliations: EMPOWERgmat
Joined: 19 Dec 2014
Posts: 15263
Location: United States (CA)
GMAT 1: 800 Q51 V49 GRE 1: Q170 V170 Re: A certain bridge is 4,024 feet long. Approximately how many minutes...  [#permalink]

Show Tags

8
1
Hi amandakay,

The GMAT would never expect you to calculate the exact value of 4024/5280, so if you're ever thinking about doing something so "calculation heavy", then there's almost certainly a faster or easier way to get to the correct answer. In this prompt, you should notice the word "approximately" - that means that you DON'T have to calculate that fraction, but you do have to estimate the value.

If we 'round down', then 4024 ft./5280 ft. is a little less than 4/5 of a mile. Knowing THAT, and that 20 mph is 1 mile every 3 minutes, can you correctly answer the question?

GMAT assassins aren't born, they're made,
Rich
_________________
Intern  B
Joined: 13 Aug 2016
Posts: 1
Re: A certain bridge is 4,024 feet long. Approximately how many minutes...  [#permalink]

Show Tags

46
12
Here's another method that allowed me to solve the question in approximately 30 seconds:

20 miles per hour translates to traveling 1 mile every 3 minutes. Since the bridge is longer than 1/2 mile but shorter than 1 mile, the answer must be between 1.5 and 3 minutes. The only answer choice that fits this range is 2 minutes.
General Discussion
Manager  Joined: 18 Jan 2010
Posts: 246
Re: A certain bridge is 4,024 feet long. Approximately how many minutes...  [#permalink]

Show Tags

2
In this question unit of measurements have to be taken care of.

Distance: 4024 feet. This is (4024/5280) miles = 0.76 miles

Speed: 20 miles per hour

Time: (Distance / Speed) (0.76/20) {This will come in Hours}. Multiply by 60 to get answer in minutes. It is 2.28 minutes.

Answer to be 2 minutes.
Intern  B
Joined: 05 May 2016
Posts: 20
Location: United States
WE: Web Development (Computer Software)
Re: A certain bridge is 4,024 feet long. Approximately how many minutes...  [#permalink]

Show Tags

7
1
3
nalinnair wrote:
A certain bridge is 4,024 feet long. Approximately how many minutes does it take to cross this bridge at a constant speed of 20 miles per hour? (1 mile = 5,280 feet)

(A) 1
(B) 2
(C) 4
(D) 6
(E) 7

First, convert the speed to feet per minute.

20 miles per hour = ( 20 * 5280 ) feet per 60 minutes.

Time = $$\frac{Distance}{Speed}$$ = $$\frac{4024}{(20 * 5280 ) / 60}$$ = $$\frac{4024 *60}{20 * 5280}$$ = $$\frac{4024 * 3}{5280}$$ = $$\frac{4024}{5280}$$*3

$$\frac{4024}{5280}$$ < 1. Therefore, Time < 3.

We can eliminate (A) because $$\frac{4024}{5280}$$ is not equal to $$\frac{1}{3}$$. The only answer choice remaining is (B). Therefore, (B) is the answer.
VP  P
Joined: 07 Dec 2014
Posts: 1222
A certain bridge is 4,024 feet long. Approximately how many minutes...  [#permalink]

Show Tags

~3/4 miles/(1/3) mpm=~2 minutes
Intern  Joined: 19 Mar 2017
Posts: 1
Re: A certain bridge is 4,024 feet long. Approximately how many minutes...  [#permalink]

Show Tags

Does anyone have a tip for a quick way to solve the division of 4024/5280? This is where I spend the majority of my time on the problem and am wondering if I can do something faster. I do a lot of trial and error.
Director  S
Status: Come! Fall in Love with Learning!
Joined: 05 Jan 2017
Posts: 532
Location: India
Re: A certain bridge is 4,024 feet long. Approximately how many minutes...  [#permalink]

Show Tags

nalinnair wrote:
A certain bridge is 4,024 feet long. Approximately how many minutes does it take to cross this bridge at a constant speed of 20 miles per hour? (1 mile = 5,280 feet)

(A) 1
(B) 2
(C) 4
(D) 6
(E) 7

distance = 4024 ft = 4024/5280 miles

time taken = 4024/5280*20 hours= 0.76 hours = 2.28 minutes close to 2 minutes

option B
_________________
GMAT Mentors Manager  S
Joined: 22 Nov 2016
Posts: 202
Location: United States
GPA: 3.4
A certain bridge is 4,024 feet long. Approximately how many minutes...  [#permalink]

Show Tags

3
1

Approximation!

D=4000
R=20mph
Convert it to miles per minutes = $$\frac{20}{60}$$
R = $$\frac{1}{3}$$

1 mile = approx 5000 feet

$$T=\frac{D}{R}$$ $$=\frac{(4000*3)}{5000}$$ $$=\frac{12000}{5000}$$ $$=\frac{12}{5}$$ = 2.4

Since the denominator is slightly more than 5000, the value will be less than 2.4.
i.e B
_________________
Kudosity killed the cat but your kudos can save it.
VP  D
Joined: 09 Mar 2016
Posts: 1230
Re: A certain bridge is 4,024 feet long. Approximately how many minutes...  [#permalink]

Show Tags

2
nalinnair wrote:
A certain bridge is 4,024 feet long. Approximately how many minutes does it take to cross this bridge at a constant speed of 20 miles per hour? (1 mile = 5,280 feet)

(A) 1
(B) 2
(C) 4
(D) 6
(E) 7

hello friends here is a quick way to solve it

if 20 miles = 60 min---> then 1 mile = 3 min

if length of bridge (4,024 feet) is shorter than 1 mile (5,280 feet)

then only option is B Manager  S
Joined: 20 Jul 2018
Posts: 87
GPA: 2.87
Re: A certain bridge is 4,024 feet long. Approximately how many minutes...  [#permalink]

Show Tags

1
Convert the rate from miles per hour to feet per minute.
20 miles per hour = 20*5280/60 = 1760
Now devide distance by rate to find time
Time = 4024/1760 =~2

Posted from my mobile device
_________________
Hasnain Afzal

"When you wanna succeed as bad as you wanna breathe, then you will be successful." -Eric Thomas
Target Test Prep Representative D
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
Posts: 8085
Location: United States (CA)
Re: A certain bridge is 4,024 feet long. Approximately how many minutes...  [#permalink]

Show Tags

nalinnair wrote:
A certain bridge is 4,024 feet long. Approximately how many minutes does it take to cross this bridge at a constant speed of 20 miles per hour? (1 mile = 5,280 feet)

(A) 1
(B) 2
(C) 4
(D) 6
(E) 7

The length of the bridge, in miles, is:

4,024/5,280 = 503/660, which is about 500/660 = 50/66 = 25/33.

Using the formula: time = distance/rate, we see that the time, in hours, is:

[25/33]/20 = 25/(33 x 20) hours

So the time in minutes is:

25/(33 x 20) x 60 = (25 x 3)/33 = 25/11, which is about 2 minutes.

_________________

Scott Woodbury-Stewart

Founder and CEO

Scott@TargetTestPrep.com

See why Target Test Prep is the top rated GMAT quant course on GMAT Club. Read Our Reviews

If you find one of my posts helpful, please take a moment to click on the "Kudos" button.

Intern  B
Joined: 26 Apr 2015
Posts: 19
Location: United States
GMAT 1: 680 Q47 V36 GMAT 2: 700 Q48 V38 GPA: 3.91
A certain bridge is 4,024 feet long. Approximately how many minutes...  [#permalink]

Show Tags

nalinnair wrote:
A certain bridge is 4,024 feet long. Approximately how many minutes does it take to cross this bridge at a constant speed of 20 miles per hour? (1 mile = 5,280 feet)

(A) 1
(B) 2
(C) 4
(D) 6
(E) 7

I used a combination of algebra and backsolve to tackle this problem in <1min:

Figure out the rate in ft / min: $$\frac{20 mi}{hour}*\frac{*1 hr}{60 min}*\frac{1 mi}{5280 ft} = \frac{5280 ft}{3 min}$$

By examination, (B) is the only that makes the most sense. In other words, 4,024 is about 2/3 of 5,280.
Non-Human User Joined: 09 Sep 2013
Posts: 13204
Re: A certain bridge is 4,024 feet long. Approximately how many minutes...  [#permalink]

Show Tags

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: A certain bridge is 4,024 feet long. Approximately how many minutes...   [#permalink] 14 Oct 2019, 13:00
Display posts from previous: Sort by

A certain bridge is 4,024 feet long. Approximately how many minutes...

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne  