table tennis ball is dropped from a height of 25 meters. The height of each jump is (2/5) of the height when it falls, and (2/5) of the height when it falls for the second time. It can jump when it falls for the second time. How much is it?
一个乒乓球从25米的高处下落，每次跳起的高度是下落时高度的(2/5)，它第二次下落时高度的(2/5)，它第二次下落时能跳起多少米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">25 * (2/5)</gadget>
<output>10</output>

<gadget id="calculator">10 * (2/5)</gadget>
<output>4</output>

<result>4</result>