The distance between city A and city B is 440 meters. Wang Xin travels from city A to city B to visit her aunt. After driving for 4 hours, she is still 84 kilometers away from city B. How many kilometers does the car drive per hour?
A城和B城相距440米，王心乘车从A城到B城看望姑姑，汽车行驶了4小时后，距B城还有84千米，汽车每小时行驶多少千米？
<gadget id="calculator">440 - 84</gadget>
<output>356</output>

<gadget id="calculator">356 / 4</gadget>
<output>89</output>

<result>89</result>