There are 550 tons of cargo at a certain station, and the convoy transported 330 tons in 3 hours. According to this calculation, how many hours will the rest be transported? (Solve with ratio)
某车站有550吨货物，车队工作3小时运了330吨，照这样计算，其余的还要运几小时？(用比例解)
<gadget id="calculator">550 - 330</gadget>
<output>220</output>

<gadget id="calculator">330 / 3</gadget>
<output>110</output>

<gadget id="calculator">220 / 110</gadget>
<output>2</output>

<result>2</result>