A cuboid water tank is 9 decimeters long, 5 decimeters wide, 2 decimeters high and 1.2 decimeters high from the inside. If a stone with a volume of 13.5 cubic decimeters is completely submerged in water, what is the height of the water in decimeters?
一种长方体水槽，从里面量长9分米，宽5分米，高2分米，水面高1.2分米．把一块体积是13.5立方分米的石头完全浸没在水中后，水面高多少分米？
<gadget id="calculator">9 * 5</gadget>
<output>45</output>

<gadget id="calculator">13.5 / 45</gadget>
<output>0.3</output>

<gadget id="calculator">1.2 + 0.3</gadget>
<output>1.5</output>

<result>1.5</result>