On the same expressway, car B is traveling in the same direction several kilometers ahead of car A. Car A's speed is 65 km/h, it can catch up with car B in 5 hours; car A's speed is 75 km/h, it can catch up with car B in 3 hours. Can you calculate the speed of car B at that time in km/h?
在同一高速公路上，乙车在甲车前面若干千米同向行驶．甲车的速度是65千米/小时，它5小时可追上乙车；甲车的速度是75千米/小时，它3小时可追上乙车．能算出，那时乙车的速度是多少千米/小时．
<gadget id="calculator">65 * 5</gadget>
<output>325</output>

<gadget id="calculator">75 * 3</gadget>
<output>225</output>

<gadget id="calculator">325 - 225</gadget>
<output>100</output>

<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">100 / 2</gadget>
<output>50</output>

<result>50</result>