The railway from Changsha to Guangzhou is 726 kilometers long, and an express train runs from Changsha to Guangzhou, traveling 242 kilometers in 2 hours. At this speed, how many hours will it take to get to Guangzhou?
长沙到广州的铁路长726千米，一列特快列车从长少开往广州，2小时行驶242千米．照这样的速度，还需要几小时才能到广州？
<gadget id="calculator">242 / 2</gadget>
<output>121</output>

<gadget id="calculator">726 / 121</gadget>
<output>6</output>

<gadget id="calculator">6 - 2</gadget>
<output>4</output>

<result>4</result>