car drives from place A to place B, travels 75 kilometers per hour, arrives at place B after driving for 2 hours, returns immediately and takes 3 hours to return to place A, what is the average speed of this car during the round trip? m/h?
一辆汽车从甲地开往乙地，每小时行驶75千米，行驶2小时后到达乙地，立刻返回用了3小时回到甲地，问这辆汽车往返过程中的平均速度是多少千米/小时？
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">75 * 2 * (2/5)</gadget>
<output>60</output>

<result>60</result>