There is a pile of gravel, which can be loaded with 140 medium-sized trucks and 80 large-sized trucks. Each medium-sized truck can load 1.8 tons less than a large-sized truck. How many tons is this pile of gravel?
有一堆砂石，用中型卡车140辆可以装完，用大型卡车80辆可以装完，每辆中型卡车比大型卡车少装1.8吨，这堆砂石有多少吨？
<gadget id="calculator">1 / 80</gadget>
<output>1/80 = around 0.0125</output>

<gadget id="calculator">1 / 140</gadget>
<output>1/140 = around 0.007143</output>

<gadget id="calculator">(1/80) - (1/140)</gadget>
<output>3/560 = around 0.005357</output>

<gadget id="calculator">1.8 / (3/560)</gadget>
<output>336</output>

<result>336</result>