The speed of the car going up the mountain is 24 kilometers per hour, and the speed of going down the mountain by the same road is 48 kilometers per hour. What is the average speed of this car going up and down the hill?
汽车上山的速度是每小时行24千米，按原路下山，每小时行48千米．求这辆汽车上、下山的平均速度是多少？
<gadget id="calculator">1 * 2</gadget>
<output>2</output>

<gadget id="calculator">1 / 24</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">1 / 48</gadget>
<output>1/48 = around 0.020833</output>

<gadget id="calculator">(1/24) + (1/48)</gadget>
<output>1/16 = around 0.0625</output>

<gadget id="calculator">2 / (1/16)</gadget>
<output>32</output>

<result>32</result>