In the past, it took about 3 hours for ships to pass the Three Gorges Dam. After the ship lift was put into use in 2004, it was reduced (7/9). After using the ship lift, how many hours will it take for the ship to pass the Three Gorges Dam?
过去船只经过三峡大坝大约要用3小时，2004年升船机投入使用后，比原来减少了(7/9)．使用升船机后，船只经过三峡大坝大约要用多少小时？
<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">1 - (7/9)</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">3 * (2/9)</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>