In a mountaineering competition, an old goat walks 40 meters per minute uphill and 60 meters per minute downhill. Then, how many meters per minute does this old goat walk uphill and downhill on average?
在一次登山比赛中，一只老山羊上山每分钟走40m，下山每分钟走60m，那么，这只老山羊上山、下山平均每分钟走多少米？
<gadget id="calculator">1 + 1</gadget>
<output>2</output>

<gadget id="calculator">1 / 40</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">1 / 60</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">(1/40) + (1/60)</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">2 / (1/24)</gadget>
<output>48</output>

<result>48</result>