Uncle Li went to work on the tenth floor of a ten-story building. It happened that there was a power outage and the elevator could not be used. It took him 80 seconds to walk from the first floor to the fifth floor. At this speed, how many seconds will it take to reach the tenth floor?
李叔叔到十层大楼的第十层办事，恰逢停电，电梯不能用．他从一层走到第五层用了80秒，照这样的速度，走到第十层共需要多少秒才能到达．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">80 / 4</gadget>
<output>20</output>

<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">20 * 9</gadget>
<output>180</output>

<result>180</result>