Cars A and B leave at the same speed from places A and B at the same time. After 4 hours of departure, the distance between the two cars is 40 kilometers, accounting for 1/9 of the whole journey. Find the speed of cars A and B (considering various situations)
甲乙两车以同样的速度从A、B两地同时相对开出，出发4小时后两车相距40千米，占全程的(1/9)，求甲乙两车的速度(考虑多种情况)
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">40 / (1/9)</gadget>
<output>360</output>

<gadget id="calculator">1 + (1/9)</gadget>
<output>10/9 = around 1.111111</output>

<gadget id="calculator">(10/9) / 4 / 2</gadget>
<output>5/36 = around 0.138889</output>

<gadget id="calculator">360 * (5/36)</gadget>
<output>50</output>

<result>50</result>