Xiao Hong went to school from home. When he set off, he looked at his watch and found that if he walked 80 meters per minute, he would be 5 minutes late; Arrive at school 1 minute early. Ask Xiaohong how many minutes until he arrives at school on time when he leaves home?
小宏从家到校上学，出发时他看看表，发现如果每分钟步行80米，他将迟到5分钟；如果先步行10分钟后，再改成骑车每分钟行200米，他就可以提前1分钟到校．问小宏从家出发时离按时到校时间有几分钟？
<gadget id="calculator">80 * 5</gadget>
<output>400</output>

<gadget id="calculator">200 * 1</gadget>
<output>200</output>

<gadget id="calculator">400 + 200</gadget>
<output>600</output>

<gadget id="calculator">200 - 80</gadget>
<output>120</output>

<gadget id="calculator">600 / 120</gadget>
<output>5</output>

<gadget id="calculator">5 + 10</gadget>
<output>15</output>

<result>15</result>