Jump to content

Welcome to BrainDen.com - Brain Teasers Forum

Welcome to BrainDen.com - Brain Teasers Forum. Like most online communities you must register to post in our community, but don't worry this is a simple free process. To be a part of BrainDen Forums you may create a new account or sign in if you already have an account.
As a member you could start new topics, reply to others, subscribe to topics/forums to get automatic updates, get your own profile and make new friends.

Of course, you can also enjoy our collection of amazing optical illusions and cool math games.

If you like our site, you may support us by simply clicking Google "+1" or Facebook "Like" buttons at the top.
If you have a website, we would appreciate a little link to BrainDen.

Thanks and enjoy the Den :-)
Guest Message by DevFuse

- - - - -


  • This topic is locked This topic is locked
12 replies to this topic

#11 JoeBean



  • Members
  • Pip
  • 1 posts

Posted 21 September 2010 - 09:29 AM

What is the solution of this teasers
Crossing the Desert

A military car carrying an important letter must cross a desert. There is no petrol station in the desert, and the car’s fuel tank is just enough to take it half way across. There are other cars with the same fuel capacity that can transfer their petrol to one another. There are no canisters or rope to tow the cars.
How can the letter be delivered?
  • 0

#12 rookie1ja


    Senior Member

  • Site Admin
  • PipPipPipPip
  • 1344 posts
  • Gender:Male
  • Location:Slovakia

Posted 21 September 2010 - 11:09 PM

Solution to "Crossing the Desert"
There are 4 cars needed, including the car with the important letter (which travels to the middle of the desert). Its empty tank must be filled to the top to get to the end of desert. The way between the military base (where the cars and petrol is) and the middle of the desert can be divided into 3 thirds. 3 cars will go in their thirds back and forth and overspilling 1/3 of their tanks. This way the tank of the important car will be filled and the letter will be delivered.

Apologies, the thread with solution and discussion is missing due to technical issues.
  • 0

rookie1ja (site admin)
Optical Illusions
Support BrainDen

"To start: Press any key... Where's the 'any' key?" - Homer Simpson

#13 DaneBD



  • Members
  • Pip
  • 7 posts

Posted 30 March 2011 - 03:15 AM

Looks like you're using fewer cars as an optimum response to the need of crossing the desert, when you should be using the apparently unlimited supply of cars and gas to get the letter across the desert as quickly as possible. Time is always the senior consideration. Here's how I would try to do it: With eight cars full of gas, one with letter, go to 1/4 the distance, empty four tanks into the other four, and go another 1/4, empty two into the other two, go the third 1/4, empty the one into the other, carrying the letter, and make it to the other side. You did one fill from the 'home depot', three fuel transfer operations in the desert, and spent no time waiting in the desert for the rest of your gas. The mission would be accomplished in a minimum of time, and that is probably the most important aspect.
  • 0

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users