A car drives from place A to place B, which is 640 kilometers away, and has traveled 240 kilometers in the first 3 hours. At this speed, how many hours will it take for the car to reach place B?
一辆汽车从相距640千米的甲地开往乙地，前3小时行驶了240千米，照这样的速度，这辆汽车还要几小时才能到达乙地？
<gadget id="calculator">640 - 240</gadget>
<output>400</output>

<gadget id="calculator">240 / 3</gadget>
<output>80</output>

<gadget id="calculator">400 / 80</gadget>
<output>5</output>

<result>5</result>