It takes (2/5) hours to cut a piece of wood into 5 pieces. If the time taken for each cut is the same, how many hours will it take to cut 7 pieces?
有一根木料用(2/5)小时截成5段如果每截一次所用的时间相同那么要截7段一共需要多少小时．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">(2/5) / 4</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">7 - 1</gadget>
<output>6</output>

<gadget id="calculator">(1/10) * 6</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>