The coal factory has 400 tons of coal, 25% of the total is shipped in the morning, and 40% of the total is shipped in the afternoon. How many tons more are shipped in the afternoon than in the morning?
煤厂有煤400吨，上午运出总数的25%，下午运出总数的40%，下午比上午多运出多少吨？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(2/5) - (1/4)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">400 * (3/20)</gadget>
<output>60</output>

<result>60</result>