A cuboid glass tank is 10 decimeters long, 8 decimeters wide and 5 decimeters high, and the water depth in the tank is 3.6 decimeters. If a square iron block with a side length of 4 decimeters is thrown in, how many decimeters is the distance from the water surface to the mouth of the tank at this time?
一个长方体玻璃缸，长10分米，宽8分米，高5分米，缸里水深3.6分米．如果投入一块棱长4分米的正方体铁块，这时水面距缸口多少分米？
<gadget id="calculator">4 * 4 * 4</gadget>
<output>64</output>

<gadget id="calculator">10 * 8</gadget>
<output>80</output>

<gadget id="calculator">64 / 80</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">5 - (4/5) - 3.6</gadget>
<output>0.6</output>

<result>0.6</result>