The flying speed of a transport plane is 840 km/h, which is 9 times that of a passenger car and 30 kilometers more. What is the speed of this passenger car?
一种运输机的飞行速度是840千米/小时，是一种客运汽车的9倍还多30千米，这种客运汽车的速度是多少？
<gadget id="calculator">840 - 30</gadget>
<output>810</output>

<gadget id="calculator">810 / 9</gadget>
<output>90</output>

<result>90</result>