The distance between A and B is 470 kilometers. Car A travels at 46 kilometers per hour, and car B travels from the two places at a speed of 40 kilometers per hour. Think about it, and when they meet, car A travels 230 kilometers. Question: How many hours does car B leave earlier than car A?
A、B两地相隔470千米，甲车以每小时46千米，乙车以每小时40千米的速度先后从两地出发，想想而行，相遇时甲车行了230千米．问：乙车比甲车早出发多少小时．
<gadget id="calculator">470 - 230</gadget>
<output>240</output>

<gadget id="calculator">240 / 40</gadget>
<output>6</output>

<gadget id="calculator">230 / 46</gadget>
<output>5</output>

<gadget id="calculator">6 - 5</gadget>
<output>1</output>

<result>1</result>