To build a 3,000-meter-long road, 40% of the first phase has been completed, and 30% of the second phase has been completed. How much more meters will be repaired in the first phase than in the second phase?
修一条3000米长的公路，第一期完成了40%，第二期完成了30%，第一期比第二期多修多少米？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(2/5) - (3/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">3_000 * (1/10)</gadget>
<output>300</output>

<result>300</result>