Sinking Ship Riddle

Puzzle of the Day 2158 : Sinking Ship Riddle
5 seconds Puzzle – Presence of Mind

Riddle :

180 cm ladder hangs on side of a ship.
The bottom step touches the water.
The distance b/w steps is 20 cm.
The tide is rising at the rate of 15 cm each hour.

When will the water reach the seventh step from the top?

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