It took Xiao Ming 0.4 minutes to walk from the first floor to the third floor. At this speed, how many minutes will it take him to walk to the eighth floor?
小明从一楼走到三楼用了0.4分钟，按这个速度，他再走到八楼，还要用多少分钟．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">0.4 / 2</gadget>
<output>0.2</output>

<gadget id="calculator">8 - 3</gadget>
<output>5</output>

<gadget id="calculator">0.2 * 5</gadget>
<output>1</output>

<result>1</result>