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

It is currently 18 Nov 2018, 11:12

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 in November
PrevNext
SuMoTuWeThFrSa
28293031123
45678910
11121314151617
18192021222324
2526272829301
Open Detailed Calendar
  • How to QUICKLY Solve GMAT Questions - GMAT Club Chat

     November 20, 2018

     November 20, 2018

     09:00 AM PST

     10:00 AM PST

    The reward for signing up with the registration form and attending the chat is: 6 free examPAL quizzes to practice your new skills after the chat.
  • The winning strategy for 700+ on the GMAT

     November 20, 2018

     November 20, 2018

     06:00 PM EST

     07:00 PM EST

    What people who reach the high 700's do differently? We're going to share insights, tips and strategies from data we collected on over 50,000 students who used examPAL.

A searchlight on top of the watch-tower makes 3 revolutions

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

Hide Tags

Intern
Intern
avatar
Joined: 09 Sep 2014
Posts: 6
A searchlight on top of the watch-tower makes 3 revolutions  [#permalink]

Show Tags

New post 08 Oct 2014, 15:29
A very literal solution...


One minute <-------------|---------------|---------------->
************************** 14-24 **********36-44*************

Segment at which darkness will intercede 5 seconds

Time between 15+9+15 = 13/20

& Closest answer is 3/4.....
Intern
Intern
avatar
B
Joined: 02 Dec 2017
Posts: 2
Re: A searchlight on top of the watch-tower makes 3 revolutions  [#permalink]

Show Tags

New post 04 Feb 2018, 07:35
I approached this question as if the length of a minute is the length of a rope. Let's say we have a length of a rope-60cm. And every 20cm, there is a cut.
--------20--------20--------20
-----15-20-----15-20------15-20
Probability of man being in every 15 cm or less is calculated as follows. Overall there are 5+5+5 areas that the man should not stand, if it wants to be waiting at least 5 seconds (which are the areas between 15 and 20, 35 and 40, 55 and 60). Overall, 5+5+5=15. P=1- 15/60=3/4
GMAT Club Bot
Re: A searchlight on top of the watch-tower makes 3 revolutions &nbs [#permalink] 04 Feb 2018, 07:35

Go to page   Previous    1   2   [ 22 posts ] 

Display posts from previous: Sort by

A searchlight on top of the watch-tower makes 3 revolutions

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


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®.