It’s raining, and Xiaohong’s mother decides to go to school to give Xiaohong an umbrella. At this time, Xiaohong is rushing home from school in the rain. It takes Xiaohong 15 minutes to walk home from school, and her mother’s walking speed is twice as fast as him. ． In a few minutes, can mom pick up Xiaohong?
下雨了，小红的妈妈决定去学校给小红送伞，而此时小红正好从学校冒雨往家赶，小红从学校走到家要15分钟，妈妈步行的速度是他的两倍．几分钟后，妈妈能接到小红？
<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">15 / 2</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">1 / (15/2)</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">(1/15) + (2/15)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / (1/5)</gadget>
<output>5</output>

<result>5</result>