Maglev trains consume very little energy. Its average energy consumption of each seat is 70% of that of a car, and the average energy consumption of each seat of a car is that of an airplane (10/21), then the average energy consumption of each seat of an airplane is the average energy consumption of each seat of a maglev train How many times the energy consumption.
磁悬浮列车的能耗很低．它的每个座位的平均能耗是汽车的70%，而汽车每个座位的平均能耗是飞机的(10/21)，则飞机每个座位的平均能耗是磁悬浮列车每个座位的平均能耗的多少倍．
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">10 / 21</gadget>
<output>10/21 = around 0.47619</output>

<gadget id="calculator">1 / (7/10) / (10/21) / 1</gadget>
<output>3</output>

<result>3</result>