There are 2 liters of water in a measuring cylinder. Put a cuboid iron block with a length of 0.8 decimeters and a width of 0.9 decimeters (the water completely submerges the iron block). The water rises to the mark of 2.9 liters. What is the height of the cuboid iron block? ?
一个量筒里有2升水，放入一个长0.8分米，宽0.9分米的长方体铁块(水把铁块全部淹没)水上升到2.9升的刻度处，这个长方体铁块的高是多少分米？
<gadget id="calculator">2.9 - 2</gadget>
<output>0.9</output>

<gadget id="calculator">0.8 * 0.9</gadget>
<output>0.72</output>

<gadget id="calculator">0.9 / 0.72</gadget>
<output>1.25</output>

<result>1.25</result>