Fatty goes to school by car and walks home. It takes 55 minutes to go back and forth, and it only takes 10 minutes to go back and forth by car. If you walk, how many minutes will it take?
小胖乘车去上学，步行回家，来回一共用去55分钟，如果来回都乘车只要10分钟．如果都步行，要用多少分钟？
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">55 - 5</gadget>
<output>50</output>

<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<result>100</result>