car drives from place A to place B. It takes 4 hours to drive 6 kilometers per hour, and it takes 1 hour less to return. How many kilometers per hour does the car travel when it returns?
一辆汽车从甲地开往乙地，去时每小时行6千米，共用了4小时，返回时少用了1小时，这辆汽车返回时每小时行多少千米？
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">4 / 3</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">6 * (4/3)</gadget>
<output>8</output>

<result>8</result>