The speed of the maglev train is 400 km/h. The speed of ordinary trains is 120 km/h. How much slower is an ordinary train than a maglev train?
磁悬浮列车的速度为400千米/小时．普通列车的速度为120千米/小时．普通火车的速度比磁悬浮列车慢百分之几？
<gadget id="calculator">400 - 120</gadget>
<output>280</output>

<gadget id="calculator">280 / 400</gadget>
<output>7/10 = around 0.7</output>

<result>7/10 = around 0.7</result>