Uncle Chen sent a cart of goods to the shopping mall at a speed of 60 km/h. It took 5 hours to deliver it, and only 4 hours to return it. What was the speed when it returned?
陈叔叔把一车货物送到商场，去时的速度60千米/时，用了5小时送到，返回时只用了4小时，返回时的速度是多少？
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

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

<result>75</result>