The train from Nanchang to Shanghai originally travels 120 kilometers per hour and takes 5 hours to arrive. After the speed of the railway is increased, the speed of the train reaches 150 kilometers per hour. How long does it take now from Nanchang to Shanghai?
火车从南昌到上海，原来每小时行驶120千米，要5小时才能到达．铁路提速后，火车时速达到150千米．现在从南昌到上海要多少小时？
<gadget id="calculator">5 / 150</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">120 * (1/30)</gadget>
<output>4</output>

<result>4</result>