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Bebras 2019 - Level 3 Question 12

BEBRAS · Bebras 2019 - Level 3

Question 12

Ten ants on island A are trying to get to island F to find food, as shown below.

Question illustration

At any moment, at most one ant may be on a connection between two islands. Each ant takes 1 minute to traverse a connection, and travel within an island takes negligible time. What is the maximum number of ants that can reach F after 3 minutes?
  1. 4
  2. 5
  3. 6
  4. 7