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

It is currently 22 Jan 2020, 19:50

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

Nicky and Cristina are running a race. Since Cristina is faster than N

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

Hide Tags

Find Similar Topics 
Manager
Manager
avatar
Joined: 11 Jul 2016
Posts: 77
Re: Nicky and Cristina are running a race. Since Cristina is faster than N  [#permalink]

Show Tags

New post 27 Nov 2016, 09:06
This type of word problems often trap between its wordings.
Just look at the fist line of Q - "Nicky and Cristina are running a race. Since Cristina is faster than Nicky, she gives him a 36 meter head start"
Headstart is actually a trap. The answer should include time taken by Nicky for this headstart also.
Answer should be 30 seconds option D

Attachments

WP.PNG
WP.PNG [ 266.19 KiB | Viewed 704 times ]

EMPOWERgmat Instructor
User avatar
V
Status: GMAT Assassin/Co-Founder
Affiliations: EMPOWERgmat
Joined: 19 Dec 2014
Posts: 15958
Location: United States (CA)
GMAT 1: 800 Q51 V49
GRE 1: Q170 V170
Re: Nicky and Cristina are running a race. Since Cristina is faster than N  [#permalink]

Show Tags

New post 14 Dec 2019, 19:55
Hi All,

We're told that Nicky and Cristina are running a 1,000-meter race and since Cristina is faster than Nicky, she gives him a 12 seconds head start. Cristina runs at a pace of 5 meters per second and Nicky runs at a pace of only 3 meters per second. We're asked how many seconds Nicky will have run before Cristina catches up to him. This is an example of a "chase down" question (in which one entity gets a 'head start' and then a second entity eventually catches-up to the first). These questions can be solved in a couple of ways, including by TESTing THE ANSWERS. Let's start by TESTing Answer B...

Answer B: 18 seconds
IF.... Nicky runs for 18 seconds, then he runs (18)(3) = 54 meters
Since Nicky had a 12 second head start, Cristina runs for just 18 - 12 = 6 seconds
Cristina runs (6)(5) = 30 meters, meaning that she has NOT caught up with Nicky yet. Thus, they both need to run for a LONGER period of time. Let's TEST Answer D next...

Answer D: 30 seconds
IF.... Nicky runs for 30 seconds, then he runs (30)(3) = 90 meters
Since Nicky had a 12 second head start, Cristina runs for 30 - 12 = 18 seconds
Cristina runs (18)(5) = 90 meters. This is the same distance that Nicky runs, so Cristina has caught-up to Nicky and this MUST be the answer.

Final Answer:

GMAT assassins aren't born, they're made,
Rich
_________________
Contact Rich at: Rich.C@empowergmat.com
Image


The Course Used By GMAT Club Moderators To Earn 750+

souvik101990 Score: 760 Q50 V42 ★★★★★
ENGRTOMBA2018 Score: 750 Q49 V44 ★★★★★
GMAT Club Bot
Re: Nicky and Cristina are running a race. Since Cristina is faster than N   [#permalink] 14 Dec 2019, 19:55

Go to page   Previous    1   2   [ 22 posts ] 

Display posts from previous: Sort by

Nicky and Cristina are running a race. Since Cristina is faster than N

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





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