Austrian Zebra went from QQ City to IQ City and returned the same way. And walk 120 meters per minute when going, and walk 80 meters per minute when returning. Then, the average speed of the Austrian zebra going back and forth is how many meters per minute.
奥斑马从QQ城前往IQ城并原路返回．且去时每分钟走120米，回时每分钟走80米．那么，奥斑马往返的平均速度是每分钟走多少米．
<gadget id="calculator">1 / 120</gadget>
<output>1/120 = around 0.008333</output>

<gadget id="calculator">1 / 80</gadget>
<output>1/80 = around 0.0125</output>

<gadget id="calculator">(1/120) + (1/80)</gadget>
<output>1/48 = around 0.020833</output>

<gadget id="calculator">2 / (1/48)</gadget>
<output>96</output>

<result>96</result>