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

It is currently 19 Oct 2018, 21:49

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

M07-11

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

Hide Tags

Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 50002
M07-11  [#permalink]

Show Tags

New post 16 Sep 2014, 00:34
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

75% (01:20) correct 25% (02:42) wrong based on 114 sessions

HideShow timer Statistics

A train traveling at a certain constant speed takes 30 seconds longer to travel 2 kilometers than it would take to travel 4 kilometers at 120 kilometers per hour. At what speed, in kilometers per hour, is the train traveling?

A. 24
B. 40
C. 48
D. 96
E. 120

_________________

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

Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 50002
Re M07-11  [#permalink]

Show Tags

New post 16 Sep 2014, 00:34
1
1
Official Solution:

A train traveling at a certain constant speed takes 30 seconds longer to travel 2 kilometers than it would take to travel 4 kilometers at 120 kilometers per hour. At what speed, in kilometers per hour, is the train traveling?

A. 24
B. 40
C. 48
D. 96
E. 120


Time to travel 4 kilometers at 120 kilometers per hour is \(\text{time}=\frac{\text{distance}}{\text{rate}}=\frac{4}{120} \text{hours} = \frac{4*3,600}{120} \text{seconds} = 120 \text{seconds}\);

Time to travel 2 kilometers at a regular speed is \(120+30 = 150 \text{seconds} = \frac{150}{3,600} = \frac{1}{24} \text{hours}\);

So, the speed of a train is \(\text{rate}=\frac{\text{distance}}{\text{time}}=\frac{2}{(1/24)}=48\) kilometers per hour.


Answer: C
_________________

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

Intern
Intern
avatar
Joined: 17 Sep 2015
Posts: 12
GMAT 1: 760 Q50 V42
GPA: 3.65
Reviews Badge
Re: M07-11  [#permalink]

Show Tags

New post 29 Oct 2015, 17:13
seems like a 700 level problem, not sub-600.
VP
VP
avatar
P
Joined: 07 Dec 2014
Posts: 1104
Re: M07-11  [#permalink]

Show Tags

New post 08 Jan 2016, 18:14
2
let s=speed
2/s-4/120=1/120
s=48 kph
Intern
Intern
avatar
Joined: 06 May 2016
Posts: 14
Re: M07-11  [#permalink]

Show Tags

New post 04 Aug 2016, 11:48
time taken for second train travelling at 120Kmph= 4/120 = 1/30 hr

Total time for the first train travelling at x speed = 30/3600 + 1/30 = 1/24 hr

speed = distance /time= 2km/(1/24) hr = 48 kmph
Intern
Intern
User avatar
B
Joined: 27 Apr 2011
Posts: 47
GMAT Date: 06-13-2017
GMAT ToolKit User Reviews Badge CAT Tests
Re: M07-11  [#permalink]

Show Tags

New post 01 Aug 2018, 02:46
The question is absolutely 700 level. Great Language trap.
_________________

Hope it's clear.
_________________
Please +1 KUDO if my post helps. Thank you.

GMAT Club Bot
Re: M07-11 &nbs [#permalink] 01 Aug 2018, 02:46
Display posts from previous: Sort by

M07-11

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

Moderators: chetan2u, Bunuel



Copyright

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®.