In a certain building, the elevator goes up and down at the same speed, and each floor takes 3 seconds. Zhang Fan lives on the 11th floor of this building. How many seconds does it take to take the elevator up and down (excluding the dwell time)?
某幢大楼电梯上、下的速度相同，每上一层需3秒，张帆住在这幢大楼的11楼，乘电梯上、下(不计停留时间)共需几秒钟？
<gadget id="calculator">11 - 1</gadget>
<output>10</output>

<gadget id="calculator">10 * 2 * 3</gadget>
<output>60</output>

<result>60</result>