The boat and the ladder

1. The boat is NOT anchored to the bottom. It floats freely on water following Archimedes' principle.
2. Many people calculate: 3 hours × 15 cm/hour = 45 cm.
3. Many people calculate: 45 cm ÷ 20 cm/step = 2.25 steps.

Answer: No additional steps will be covered. The visible steps remain constant.

Conceptual explanation:
Visual comparison:
Initial situation (low tide):

• Steps 5, 6, 7, 8 visible over the water
• The boat floats at the current water level

After 3 hours (high tide +45cm):

• Steps 5, 6, 7, 8 are still visible over the water
• The ship has risen along with the water
• The ladder went up with the ship

Key concept:
The boat is NOT anchored to the bottom. It floats freely on water following Archimedes' principle.
Physical analysis:

1. Tide rises → Water level increases 15 cm/hour
2. Water pushes boat → Buoyancy force increases
3. Boat rises → It rises exactly 15 cm/hour
4. Ladder fixed to the boat → The ladder rises with the boat
5. Relative distance → Water-steps remains constant

The problem trap:
Many people calculate:

• 3 hours × 15 cm/hour = 45 cm
• 45 cm ÷ 20 cm/step = 2.25 steps

But this calculation assumes that the ladder is fixed to the dock or bottom, which it is not!