The speed of the car going up the mountain is 36 kilometers per hour. It takes 4 hours to reach the top of the mountain, and it only takes 3 hours to return to the original road when going down the mountain. How many kilometers per hour does the car travel on average when going downhill?
汽车上山的速度为每小时36千米，行了4小时到达山顶，下山时按原路返回只用了3小时．汽车下山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">36 * (4/3)</gadget>
<output>48</output>

<result>48</result>