The road between A and B is 238 kilometers long. A car travels 102 kilometers from place A to place B in the first 3 hours. According to this calculation, how many hours can you reach B? (Solve with ratio)
甲、乙两地之间的公路长238千米．一辆汽车从甲地开往乙地，头3小时行驶了102千米．照这样计算，几小时可以到达乙地？(用比例解)
<gadget id="calculator">238 * 3</gadget>
<output>714</output>

<gadget id="calculator">714 / 102</gadget>
<output>7</output>

<result>7</result>