A bathtub can hold 420 liters of water. If 1400 milliliters of water is put in every second, how many minutes can it be filled?
一个浴缸可盛水420升，如果每秒放1400毫升水，多少分钟可以放满．
<gadget id="calculator">1_400 / 1_000</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">420 / (7/5)</gadget>
<output>300</output>

<result>300</result>