A car traveling at a speed of 60 km/h travels from point A to point B for 15 hours. How long will it take the car to return if it travels 90 km/h?
一辆汽车的速度是60千米/时，从甲地到乙地行了15时．如果返回时每时行90千米，这辆汽车返回的时间是多少？
<gadget id="calculator">15 / 90</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">60 * (1/6)</gadget>
<output>10</output>

<result>10</result>