The ship and the ladder

Level pending

A ship is sailing in the ocean and has a ladder attached to it. The ladder has 12 rungs, each 30 cm apart. At 10.00p.m. the water level is at the bottom rung. Then, the water level rises at a rate of 10cm/min and reaches the top rung at a certain time. What is that time?

(1) 10.33p.m. (2) 10.36p.m. (3) 10.39p.m. (4) None of the above

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