car travels 40 kilometers per hour up the mountain and reaches the top of the mountain in 3 hours. It takes only 2 hours to go down the mountain. What is the average speed of the car when going down the mountain in kilometers per hour?
一辆汽车上山每小时行40千米，3小时到达山顶．下山只用2小时，这辆汽车下山时的平均速度是每小时多少千米．
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">40 * (3/2)</gadget>
<output>60</output>

<result>60</result>