A certain engineering team completed (3/5) of the whole project on the first day, and completed less (1/5) of the whole project on the second day than on the first day, what percentage of the whole project was completed on the second day?
某工程队第一天完成全工程的(3/5)，第二天比第一天少完成全工程的(1/5)，第二天完成全工程的几分之几？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

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