Master Zhang delivered fruit from the orchard to the supermarket. It took 6 hours to go at a speed of 35 km/h, and only 5 hours to return. How many kilometers per hour did you travel on average when you returned?
张师傅从果园给超市送水果．去时的速度是35千米/时，用了6小时，返回时只用了5小时．返回时平均每小时行多少千米？
<gadget id="calculator">6 / 5</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">35 * (6/5)</gadget>
<output>42</output>

<result>42</result>