The rocket flies 4500 meters per second, how many kilometers per minute.
火箭每秒飞行4500米，每分钟飞行多少千米．
<gadget id="calculator">60 / 1_000</gadget>
<output>3/50 = around 0.06</output>

<gadget id="calculator">4_500 * 1 * (3/50)</gadget>
<output>270</output>

<result>270</result>