Lingling walks to school and has already walked for 5 minutes. The ratio of the distance traveled to the remaining distance is 1:2. At this speed, how many minutes will it take to reach the school?
玲玲步行去上学，现已走了5分钟，走过的路程和剩下的路程的比为1：2，照这样的速度，走到学校一共需要多少分钟？
<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">5 / (1/3)</gadget>
<output>15</output>

<result>15</result>