It takes 20 hours for team A to transport a batch of goods alone, and team B transports 36 tons per hour. Now the two teams transport at the same time. The ratio of the tons transported by team A and team B is 7:3. How many tons is this shipment?
运送一批货物，甲队单独完成需要20小时，乙队每小时运36吨，现两队同时运，完成时甲、乙两队所运吨数的比是7：3．这批货物有多少吨？
<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1 - (7/10)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">7 + 3</gadget>
<output>10</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(7/10) / (1/20)</gadget>
<output>14</output>

<gadget id="calculator">(3/10) / 14</gadget>
<output>3/140 = around 0.021429</output>

<gadget id="calculator">36 / (3/140)</gadget>
<output>1_680</output>

<result>1_680</result>