Angie's family traveled by car and traveled 168 kilometers in 4 hours. According to this calculation, how many hours will it take to travel 294 kilometers?
安琪一家人开车外出旅游，4小时行驶了168千米．照这样计算，要行驶294千米，需要几小时？
<gadget id="calculator">168 / 4</gadget>
<output>42</output>

<gadget id="calculator">294 / 42</gadget>
<output>7</output>

<result>7</result>