A car travels 260 meters in 4 hours, and a bus travels 15 kilometers less than a car per hour. How many kilometers does a bus travel per hour?
一辆小汽车4小时行了260米，一辆大客车每小时比小汽车少行15千米，一辆大客车每小时行多少千米？
<gadget id="calculator">260 / 4</gadget>
<output>65</output>

<gadget id="calculator">65 - 15</gadget>
<output>50</output>

<result>50</result>