The depths of cylindrical containers A and B are equal, and the radii of the bottom surfaces are 3 cm and 4 cm respectively. Fill the container A with water and pour it into the container B. The water depth is 1.2 cm lower than the (3/4) of the container. What is the depth of container B in centimeters?
圆柱体容器A和B的深度相等，底面半径分别为3厘米和4厘米，把A容器装满水倒入B容器里，水深比容器的(3/4)低1.2厘米．B容器的深度是多少厘米？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16</gadget>
<output>50.24</output>

<gadget id="calculator">28.26 / 50.24</gadget>
<output>0.5625</output>

<gadget id="calculator">(3/4) - 0.5625</gadget>
<output>0.1875</output>

<gadget id="calculator">1.2 / 0.1875</gadget>
<output>6.4</output>

<result>6.4</result>