The speed of blood in the human body in the arteries is 0.5m per second, which is more (7/18) than that in the veins (2/3). What is the speed of blood flowing in the veins?
人体中的血液在动脉中的速度是每秒流动0.5m，比在静脉中流动速度的(2/3)还多(7/18)，血液在静脉中流动的速度是多少？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">7 / 18</gadget>
<output>7/18 = around 0.388889</output>

<gadget id="calculator">(2/3) + (7/18)</gadget>
<output>19/18 = around 1.055556</output>

<gadget id="calculator">0.5 / (19/18)</gadget>
<output>0.473684</output>

<result>0.473684</result>