Xiaohong and Xiaoli go to work together in an office building. Xiaohong goes to the fourth floor, and Xiaoli goes to the seventh floor. They go upstairs at the same time from downstairs. It took Xiaohong 0.9 minutes to arrive, how many minutes did it take Xiaoli to arrive.
小红和小丽同去一幢办公大楼办事，小红到四楼，小丽到七楼，她们同时从楼下以相同的速度上楼．小红用了0.9分钟到达，小丽应用了多少分钟到达．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">0.9 / 3</gadget>
<output>0.3</output>

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

<gadget id="calculator">0.3 * 6</gadget>
<output>1.8</output>

<result>1.8</result>