Li Min's family of three went to play in Huangshan during the holidays. His father drove from Huainan at 9:30 in the morning and arrived at 15:30. The car traveled an average of 81 kilometers per hour. How many kilometers is the distance between Huainan and Huangshan?
李敏一家三口假期到黄山去玩，爸爸开车上午9时30分从淮南出发，15：30分到达，汽车平均每小时行驶81千米，淮南到黄山相距多少千米？
<gadget id="calculator">81 * 6</gadget>
<output>486</output>

<result>486</result>