The two spacecraft "Tiangong-1" and "Shenzhou-8" need eight steps to successfully dock. The whole process takes about 10 minutes, of which the process of "pull in" takes about 240 seconds, then the process of "pull in" takes about How much of the time in the whole docking process (fill in a fraction).
"天宫一号"和"神舟八号"两个航天器需要八个步骤成功对接，整个过程大约10分钟，其中"拉近"这一过程约需240秒，那么"拉近"这一过程所用的时间占整个对接过程所用的时间的多少(填几分之几)．
<gadget id="calculator">4 / 10</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>