Dr. Johnson’s Family Dilemma on the Island
Overview of the Situation
Dr. Johnson and his family find themselves stranded on an island, requiring a plan to return to the shore. With the limitation of a rowboat that can only hold 90 kg, their situation is further complicated by the fact that none of them can swim.
Family Weights
The weights of the family members are as follows:
– Dr. Johnson: 85 kg
– Mrs. Johnson: 65 kg
– Son: 45 kg
– Daughter: 40 kg
– Dog: 8 kg
Proposed Solution for Safe Passage
To successfully navigate to the shore, the family can follow this sequence of crossings:
1. The son and daughter row across the water together.
2. The daughter disembarks on the shore while the son returns alone.
3. Next, Mrs. Johnson and the dog cross together.
4. Upon reaching the shore, Mrs. Johnson and the dog get out.
5. The daughter then returns to the island to retrieve her brother.
6. The son and daughter cross back to the shore together.
7. The daughter disembarks, and the son returns to bring Dr. Johnson.
8. Finally, the son rows across with Dr. Johnson.
9. The daughter returns once more to get her brother.
By following this sequence, the entire family can safely reach the shore without exceeding the weight limit of the rowboat.