The Two Ropes And The Lighter

You have a lighter and two ropes that take exactly one hour to burn, but they don’t burn at a steady rate. For example, one rope could take 59 minutes to burn the first inch and then burn the rest of the rope in the last minute.

How would you use these two ropes to measure 45 minutes?

Ah! Click here to read the solution.

The Six Rungs Ladder

A boat has a ladder that has six rungs. Each rung is one foot apart. The bottom rung is one foot from the water. The tide rises at 12 inches every 15 minutes. High tide peaks in one hour.

When the tide is at its highest, how many rungs are under water?

Ah! Click here to read the solution.