Cars A and B start from two places 100 kilometers apart at the same time, and drive in opposite directions. After 4 hours, the distance between them is 460 kilometers. The speed of car B is 52 km/h, find the speed of car A.
甲、乙两辆汽车同时从相距100千米两地出发，相背而行，4小时后相距460千米．乙车的速度是52千米/小时，求甲车的速度．
<gadget id="calculator">460 - 100</gadget>
<output>360</output>

<gadget id="calculator">360 / 4</gadget>
<output>90</output>

<gadget id="calculator">90 - 52</gadget>
<output>38</output>

<result>38</result>