Xiaohong walks 60 meters per minute when she goes to school, and 40 meters per minute when she leaves school. How many meters per minute did he walk on average during the round trip?
小红上学时每分钟走60米，放学时每分钟走40米．他往返过程中平均每分钟走多少米．
<gadget id="calculator">1 * 2</gadget>
<output>2</output>

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

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

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

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

<result>48</result>