The flow speed of human blood in arteries is 50 cm/s, the flow speed in veins is (2/5) that in arteries, and the speed in capillaries is only in veins (1/40). How many centimeters does blood flow in capillaries per second?
人体血液在动脉中的流动速度是50厘米/秒，在静脉中的流动速度是动脉中的(2/5)，在毛细血管中的速度只有在静脉中的(1/40)．血液在毛细血管中每秒流动多少厘米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 40</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">50 * (2/5) * (1/40)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>