long-distance sleeper bus departed at 2:30 p.m. and headed for a destination 1,697 kilometers away from the starting point. By 6:30 a.m. the next morning, it was still 561 kilometers away from the destination. How many miles per hour does the car travel on average?
一辆长途卧铺汽车从下午2时半出发，向距离出发地1697千米的目的地前进，到第二天早上6时半时，离目的地还有561千米．这辆汽车平均每小时行多少千米？
<gadget id="calculator">1_697 - 561</gadget>
<output>1_136</output>

<gadget id="calculator">1_136 / 16</gadget>
<output>71</output>

<result>71</result>