Xiaoying's passenger car went from home to her grandmother's house in other provinces, traveling at a speed of 66 kilometers per hour and arriving in 52 hours. It takes 33 hours to arrive by express train. What is the speed of the train?
小影乘客车从家去往外省的外婆家，去时时速66千米，52小时到达．来时乘坐特快列车33小时到达，请问列车时速多少？
<gadget id="calculator">52 / 33</gadget>
<output>52/33 = around 1.575758</output>

<gadget id="calculator">66 * (52/33)</gadget>
<output>104</output>

<result>104</result>