It took Xiaofang 9 seconds to walk the stairs from the first floor to the second floor. If the number of stairs between each floor is the same, how long will it take her to go up to the seventh floor at the same speed?
小芳走楼梯，从一楼到二楼用了9秒，若每层楼之间楼梯数相同，她用同样的速度上到七楼，需要多长时间？
<gadget id="calculator">2 - 1</gadget>
<output>1</output>

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

<gadget id="calculator">7 - 1</gadget>
<output>6</output>

<gadget id="calculator">9 * 6</gadget>
<output>54</output>

<result>54</result>