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

It is currently 20 Jun 2018, 12:19

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

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

The Earth travels around the Sun at an approximate speed of 20 miles p

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

Hide Tags

Expert Post
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 46207
The Earth travels around the Sun at an approximate speed of 20 miles p [#permalink]

Show Tags

New post 02 Dec 2014, 09:14
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

60% (01:02) correct 40% (01:09) wrong based on 221 sessions

HideShow timer Statistics

Tough and Tricky questions: Arithmetic.



The Earth travels around the Sun at an approximate speed of 20 miles per second. This speed is how many kilometers per hour? [1km = 0.6 miles]

A) 2,000
B) 12,000
C) 43,200
D) 72,000
E) 120,000

Kudos for a correct solution.

Source: Chili Hot GMAT

_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Manager
Manager
avatar
Joined: 12 Sep 2014
Posts: 162
Concentration: Strategy, Leadership
GMAT 1: 740 Q49 V41
GPA: 3.94
Re: The Earth travels around the Sun at an approximate speed of 20 miles p [#permalink]

Show Tags

New post 02 Dec 2014, 10:09
This is a dimensional analysis or unit-converting problem. Let's start:

20miles/second to miles/hour: 20mi/s*3600s/hr
miles/hour to kms/hour: 20mi/s*3600s/hr*1km/0.6mi

Doing this cancels out the units of miles (mi) and seconds (s) and yields km/hr and we end up with 120,000km/hr
Choice E

Note that its easier to do 3600s/hr*1km/0.6mi than to multiply anything else--so do this step first.
2 KUDOS received
SVP
SVP
User avatar
Status: The Best Or Nothing
Joined: 27 Dec 2012
Posts: 1837
Location: India
Concentration: General Management, Technology
WE: Information Technology (Computer Software)
Re: The Earth travels around the Sun at an approximate speed of 20 miles p [#permalink]

Show Tags

New post 02 Dec 2014, 20:15
2
Answer = E) 120,000

1 Km = 0.6 Miles

20 Miles = \(\frac{20}{0.6}\) Kms

Km/Hr speed \(= \frac{20}{0.6} * 60 * 60 = 200 * 10 * 60 = 120000\)
_________________

Kindly press "+1 Kudos" to appreciate :)

Expert Post
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 46207
Re: The Earth travels around the Sun at an approximate speed of 20 miles p [#permalink]

Show Tags

New post 03 Dec 2014, 07:58
Bunuel wrote:

Tough and Tricky questions: Arithmetic.



The Earth travels around the Sun at an approximate speed of 20 miles per second. This speed is how many kilometers per hour? [1km = 0.6 miles]

A) 2,000
B) 12,000
C) 43,200
D) 72,000
E) 120,000

Kudos for a correct solution.

Source: Chili Hot GMAT


The correct answer is E.
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Senior Manager
Senior Manager
avatar
Joined: 02 Dec 2014
Posts: 353
Location: Russian Federation
Concentration: General Management, Economics
GMAT 1: 640 Q44 V33
WE: Sales (Telecommunications)
Re: The Earth travels around the Sun at an approximate speed of 20 miles p [#permalink]

Show Tags

New post 09 Dec 2014, 05:59
1km=(6/10) mile hence 1 mile=(1km/(6/10))=(10/6)mile. Now Sun speed for an hour is equal to 3600 (number of seconds in an hour)*20 = 72 000 mile. To convert to km simply multiply this by (10/6). Hence (72 000 * 10)/6 = 12 000*10=120000. Hope it is clear
_________________

"Are you gangsters?" - "No we are Russians!"

Director
Director
User avatar
G
Joined: 23 Jan 2013
Posts: 597
Schools: Cambridge'16
Re: The Earth travels around the Sun at an approximate speed of 20 miles p [#permalink]

Show Tags

New post 09 Dec 2014, 21:42
1 hour = 3600 sec

20*3600=72000m/h

1/0.6=10/6 km in 1 mile

10/6*72000=120,000

E
Board of Directors
User avatar
P
Joined: 17 Jul 2014
Posts: 2730
Location: United States (IL)
Concentration: Finance, Economics
GMAT 1: 650 Q49 V30
GPA: 3.92
WE: General Management (Transportation)
GMAT ToolKit User Premium Member Reviews Badge
Re: The Earth travels around the Sun at an approximate speed of 20 miles p [#permalink]

Show Tags

New post 29 Nov 2015, 11:45
20miles/sec * 60sec/min * 60min/h = 72,000 miles / hour

now, 72,000 miles/hour * 10km/6miles
simplify miles with miles, 6 with 72, and get 12,000 * 10km/hour => 120,000.00 km
Director
Director
User avatar
S
Joined: 24 Nov 2015
Posts: 562
Location: United States (LA)
Reviews Badge
Re: The Earth travels around the Sun at an approximate speed of 20 miles p [#permalink]

Show Tags

New post 02 Apr 2016, 12:37
To calculate the equivalent of kilometres in a mile
20 miles = 20*(0.6)^-1 = 33.3334 kilometres
In 1 hour there are 60 minutes
In 1 minute there are 60 seconds
So in 1 hour there are 3600 seconds
Speed in kmph = 33.3334 * 3600 = 120000

Correct answer - E
VP
VP
User avatar
P
Status: Learning
Joined: 20 Dec 2015
Posts: 1157
Location: India
Concentration: Operations, Marketing
GMAT 1: 670 Q48 V36
GRE 1: 314 Q157 V157
GPA: 3.4
WE: Manufacturing and Production (Manufacturing)
CAT Tests
Re: The Earth travels around the Sun at an approximate speed of 20 miles p [#permalink]

Show Tags

New post 02 Sep 2017, 05:07
This question can be solved by unitary method
0.6 miles =1 km
So 20 miles =?
Number of kilometers = 20/0.6=200/6

Now to convert Seconds into hours we have to divide the second by 3600
So the speed will be =200/6*3600=12000
Hence E
_________________

Please give kudos if you found my answers useful

Re: The Earth travels around the Sun at an approximate speed of 20 miles p   [#permalink] 02 Sep 2017, 05:07
Display posts from previous: Sort by

The Earth travels around the Sun at an approximate speed of 20 miles p

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


GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

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

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.