Hongxing Primary School built a rectangular playground with a length of 60 meters and a width of 40 meters. First, it was paved with 10 cm thick concrete, and then 4 cm thick cinder. How much more cubic meters of compound soil is needed than cinder?
红星小学修一个长60米，宽40米的长方形操场，先铺10厘米厚的三合土，再铺4厘米厚的煤渣．需要的三合土比煤渣多多少立方米？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">4 / 100</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">(1/10) - (1/25)</gadget>
<output>3/50 = around 0.06</output>

<gadget id="calculator">60 * 40 * (3/50)</gadget>
<output>144</output>

<result>144</result>