Uncle Zhang drove to the fertilizer store at a speed of 60 km/h. It took 2 hours to go there. Now Uncle Zhang is going to transport the fertilizer home from the store. It took 3 hours to return from the original road. What is the speed when returning? ?
张叔叔以60千米/时的速度开车去化肥商店，去的时候用了2小时，现在张叔叔要将化肥从商店运回家，原路返回时用了3小时，返回时的速度是多少？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">60 * (2/3)</gadget>
<output>40</output>

<result>40</result>