(3/5)km is 200m.
(3/5)km的多少是200m．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) * 1_000</gadget>
<output>600</output>

<gadget id="calculator">200 / 600</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>