Problem Four: Crossing River
Nov 2nd, 2006 by tony
There are 7 people and 1 animal, Allen and his sons John and Chan, Percy and his sons Thomas and Donald, a hunter and a wolf on one side of the river. There is a boat which can carry 2 people at any time. Only Allen, Percy and the hunter can row the boat. How do they all cross the river without being killed if
1. The wolf will eat everyone if the hunter is not there.
2. Allen will eat Thomas and Donald if Percy is not there.
3. Percy will eat John and Chan if Allen is not there.
Hunter rows wolf, drops it off, rows back. Hunter rows over John, drops him off, picks up wolf, and rows back. Allen rows over Chan, drops him off, and rows back. Percy rows over Allen, drops him off, and goes back. Percy rows Thomas, picks up Allen, and rows back to the other side. Percy then rows Donald, drops him off, and comes back to the other side. Here’s where I get stuck….