A person walks to work and takes a bus to get off work. It takes one and a half hours to go back and forth. If he travels both ways, it will only take half an hour. How many hours would it take him to walk to and from get off work?
某人上班步行，下班乘车，往返一次需1个半小时．如果他往返都乘车，则只需半个小时．如果他上下班都步行，需要花多少个小时．
<gadget id="calculator">0.5 / 2</gadget>
<output>0.25</output>

<gadget id="calculator">1.5 - 0.25</gadget>
<output>1.25</output>

<gadget id="calculator">1.25 * 2</gadget>
<output>2.5</output>

<result>2.5</result>