Dr. Goat walked to work and took the bus when he returned home. It took (3/2) hours on the road. If he took the bus to and fro, the whole journey would only take (1/2) hour. How many hours would it take to walk both ways?
山羊博士上班步行，回家时坐公共汽车，在路上一共用了(3/2)小时，如果往返都坐公共汽车，全部行程只需(1/2)小时．如果往返都步行，那么需要多少小时？
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

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

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3 - (1/2)</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>