If a train travels 320 kilometers in 2 hours, how many kilometers will it travel in 3 hours?
一列火车2小时行了320千米，3小时行多少千米．
<gadget id="calculator">320 / 2</gadget>
<output>160</output>

<gadget id="calculator">160 * 3</gadget>
<output>480</output>

<result>480</result>