Sitting by the window in a train at a speed of 70 kilometers per hour, Xiao Ming saw a truck with 30 carriages coming towards him. When the front of the truck passed the window, he began to count the time until the last carriage passed the window. The recorded time is 16 seconds. It is known that each carriage of the loaned car is 15.8 meters long, the distance between carriages is 1.2 meters, and the front of the truck is 10 meters long. What is the speed of the truck?
小明靠窗坐在一列时速70千米的火车里，看到一辆有30节车厢的货车迎面驶来，当货车车头经过窗口时，他开始记时，直到最后一节车厢驶过窗口时，所记的时间是16秒，已知贷车每节车厢长15.8米，车厢间距1.2米，货车车头长10米，问货车行驶的速度是多少？
<gadget id="calculator">117 - 70</gadget>
<output>47</output>

<result>47</result>