The escalator has 120 steps and runs upwards at a speed of 1 step per second. Xiaolan wants to go upstairs at a speed of 2 meters per second. Ask her how many stairs she has passed?
电扶梯有120级并向上运行，速度是1级/秒，小兰想要上楼，它的速度是2米/秒．问她经过了多少楼梯？
<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">120 / 3</gadget>
<output>40</output>

<gadget id="calculator">2 / 1</gadget>
<output>2</output>

<gadget id="calculator">40 * 2</gadget>
<output>80</output>

<result>80</result>