Make a 5-meter-long banner, leaving 0.3 meters at both ends. The content of the banner is: I wish students a happy Chinese New Year. If each character is a square character with a side length of 0.4 meters, what is the distance between the characters in this banner?
做一条5米长的横幅，两端各留出0.3米，横幅内容是：祝同学们春节快乐若每个字是边长0.4米的方块字，这条横幅的字距是多少米．
<gadget id="calculator">0.3 * 2</gadget>
<output>0.6</output>

<gadget id="calculator">0.4 * 8</gadget>
<output>3.2</output>

<gadget id="calculator">5 - 0.6 - 3.2</gadget>
<output>1.2</output>

<gadget id="calculator">1.2 / 7</gadget>
<output>0.171429</output>

<result>0.171429</result>