The maximum speed of a car on the highway is 120 km/h, which is (2/5) the speed of a train running. Find the speed of this train.
高速公路上的汽车最高时速是120千米/时，这个速度是某列正在行驶的火车速度的(2/5)．求这列火车的速度．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">120 / (2/5)</gadget>
<output>300</output>

<result>300</result>