All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > Logic
Dysfunctional Crossing (Posted on 2005-09-26) Difficulty: 3 of 5
There are 8 people that need to cross a river. The water is too deep and fast to walk or swim across, and the only transportation device available is a raft. The raft can only be operated by adults, cannot float across the river on its own, and can carry at most two people.

The 8 people are a juvenile delinquent, her jailer, and a dysfunctional family of six: mother, father, two sons, and two daughters. To be clear, the only adults are the jailer, the mother, and the father.

Unfortunately some people fight with each other:

  • The juvenile delinquent will fight with anybody if her jailer is not present.
  • The father fights with either daughter if the mother is not present to mediate.
  • The mother fights with either son if the father is not present to mediate.
  • How can these 8 people cross the river without any fights? How many trips on the raft did it take?

    For a fun way to test out your theories, click here and then click on the blue circle.

    See The Solution Submitted by nikki    
    Rating: 4.1538 (13 votes)

    Comments: ( Back to comment list | You must be logged in to post comments.)
    re: Finally--a computer solution--bug | Comment 9 of 30 |
    (In reply to Finally--a computer solution by Charlie)

    There's a bug in my program, in not checking some return trips with a single occupant for the boat to have an adult, which allowed:

    5 DM D       DJdj          FMSs

    (a return trip by one of the daughters alone).

    I'm determined to get the programming right.

      Posted by Charlie on 2005-09-28 13:07:17
    Please log in:
    Remember me:
    Sign up! | Forgot password

    Search body:
    Forums (0)
    Newest Problems
    Random Problem
    FAQ | About This Site
    Site Statistics
    New Comments (6)
    Unsolved Problems
    Top Rated Problems
    This month's top
    Most Commented On

    Copyright © 2002 - 2018 by Animus Pactum Consulting. All rights reserved. Privacy Information