The distance from Hechuan to Chongqing is 90 kilometers, and a bus travels 30 kilometers per hour. How long does it take for this bus to travel from Hechuan to Chongqing?
合川到重庆的路程是90千米，一辆客车每小时行30千米，这辆客车由合川到重庆要用多少时间？
<gadget id="calculator">90 / 30</gadget>
<output>3</output>

<result>3</result>