It took Xiaoli 15 seconds to walk from the first floor to the second floor. With the same speed, how much does it take for Xiaoli to walk from the first floor to the fifth floor?
小丽从一楼走到二楼用了15秒，用同样的速度，小丽从一楼走到五楼需多少．
<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">15 / 1</gadget>
<output>15</output>

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">15 * 4</gadget>
<output>60</output>

<result>60</result>