Cars A and B are traveling in the same phase. Car A is 300 meters behind car B. The speed ratio is 5:3. After 50 seconds, car A catches up with car B. What is the speed of car A?
甲、乙两车同相而行，甲车在乙车后面300米，其速度比为5：3，经过50秒，甲车追上乙车，甲车的速度为多少．
<gadget id="calculator">5 * 50</gadget>
<output>250</output>

<gadget id="calculator">3 * 50</gadget>
<output>150</output>

<gadget id="calculator">250 - 150</gadget>
<output>100</output>

<gadget id="calculator">300 / 100</gadget>
<output>3</output>

<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<result>15</result>