On Sunday, Xiaohua went for an outing by bicycle. It took an average of 14 kilometers per hour to go there, and it took (6/7) hours to arrive, and it took only (3/4) hours to return by the original road. How many kilometers per hour did Xiaohua travel on average when he returned?
星期天，小华骑自行车去郊游．去时平均每小时行14千米，(6/7)小时到达，原路返回时只用了(3/4)小时．小华返回时平均每小时行多少千米？
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(6/7) / (3/4)</gadget>
<output>8/7 = around 1.142857</output>

<gadget id="calculator">14 * (8/7)</gadget>
<output>16</output>

<result>16</result>