Uncle Li left home to do business in the city. It took 3 hours to go there at a speed of 50 km/h. It took 2 hours to return. How many kilometers per hour did you travel on average when returning the same way?
李叔叔从家出发去市里办事．去的时候用了3小时，速度是50千米/时．返回时用了2小时．原路返回时平均每小时行多少千米？
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">50 * (3/2)</gadget>
<output>75</output>

<result>75</result>