It takes (2/15) hours to run 4 laps in one (2/5) kilometer lap on the playground, how many meters per hour on average?
操场一圈(2/5)千米，跑4圈用(2/15)小时，平均每小时跑多少米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">4 / (2/15)</gadget>
<output>30</output>

<gadget id="calculator">(2/5) * 30 * 1_000</gadget>
<output>12_000</output>

<result>12_000</result>