An airplane flies 720 kilometers per hour, and it takes (3/4) hours to fly (2/7) of the whole journey. How many kilometers is the whole journey?
一架飞机每小时飞行720千米，(3/4)小时飞行了全程的(2/7)．全程多少千米？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">(3/4) / (2/7)</gadget>
<output>21/8 = around 2.625</output>

<gadget id="calculator">720 * (21/8)</gadget>
<output>1_890</output>

<result>1_890</result>