It takes 4 hours for an urban and rural bus to go from the county town to the countryside, and the speed of the bus is 60 km/h. It only took 3 hours to return, how many kilometers per hour can you calculate on average?
城乡客车从县城到乡下，去的时候用了4小时，车的速度60千米/小时．返回时只用了3小时，你能算出返回时平均每小时行多少千米？
<gadget id="calculator">4 / 3</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">60 * (4/3)</gadget>
<output>80</output>

<result>80</result>