A car travels from A to B at a speed of 75 km/h and arrives in 8 hours. When returning from point B to point A, it took 10 hours because of the traffic jam. What was the average speed of the car in km/h when it returned?
一辆汽车以75千米/时的速度从甲地开往乙地，8小时到达．从乙地返回甲地时，因为堵车，用了10小时．这辆汽车返回时的平均速度是多少千米/时？
<gadget id="calculator">8 / 10</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">75 * (4/5)</gadget>
<output>60</output>

<result>60</result>