The distance between A and B is 297 kilometers. A car drives from A to B and travels 81 kilometers in 1.5 hours. At this speed, how many hours will the rest of the journey take?
甲乙两城相距297千米，一辆汽车从甲城开住乙城，1.5小时行驶了81千米．照这样的速度，余下的路程还要行驶多少小时？
<gadget id="calculator">297 - 81</gadget>
<output>216</output>

<gadget id="calculator">81 / 1.5</gadget>
<output>54</output>

<gadget id="calculator">216 / 54</gadget>
<output>4</output>

<result>4</result>