A car travels from A to B at 48 kilometers per hour, arrives in 2.5 hours, and travels back in 1.5 hours. How many miles per hour does the car travel on average?
一辆汽车从甲地开往乙地，每小时行48千米，2.5小时到达，返回时行了1.5小时．这辆汽车往返平均每小时行多少千米？
<gadget id="calculator">2.5 + 1.5</gadget>
<output>4</output>

<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">48 * 2.5 * (1/2)</gadget>
<output>60</output>

<result>60</result>