The flow speed of human blood in arteries is 50 cm/s, and the flow speed in veins is 60% slower than that in arteries. What is the speed of blood flow in veins?
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比在动脉中的动速度慢60%．血液在静脉中的流动速度是多少？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">50 * (2/5)</gadget>
<output>20</output>

<result>20</result>