A rabbit runs 42 meters per hour. A swift flies four times faster than a hare. How many kilometers per hour does this swift fly?
兔子每小时跑42米，一只雨燕的飞行速度是一只野兔奔跑速度的4倍，这只雨燕每小时大约飞行多少千米？
<gadget id="calculator">42 * 4</gadget>
<output>168</output>

<result>168</result>