The bird with the fastest long-distance flight - the swift can fly 170 kilometers per hour on average. The flying speed of the "angel of peace" carrier pigeon is 55% slower than that of the swift. How many kilometers per hour does the carrier pigeon fly?
长距离飞行最快的鸟--雨燕平均每小时能飞行170千米，"和平天使"信鸽的飞行速度比雨燕慢55%，信鸽每小时飞行多少千米？
<gadget id="calculator">55 / 100</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">1 - (11/20)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">170 * (9/20)</gadget>
<output>153/2 = around 76.5</output>

<result>153/2 = around 76.5</result>