The distance between A and B is 450 kilometers. A car has traveled from A to B for 4 hours, with an average speed of 60 kilometers per hour. At this speed, how many hours will it take to complete the journey?
甲、乙两地相距450千米，一辆汽车从甲地到乙地，已行4小时，平均每小时行60千米，照这样的速度，还要多少小时行完全程？
<gadget id="calculator">60 * 4</gadget>
<output>240</output>

<gadget id="calculator">450 - 240</gadget>
<output>210</output>

<gadget id="calculator">210 / 60</gadget>
<output>7/2 = around 3.5</output>

<result>7/2 = around 3.5</result>