On the eve of graduation, a certain school organized sixth grade students to set off from the school and walk to Wangcun, a few kilometers away from the school, to participate in social practice activities. The original plan was to arrive in 5 hours, but the actual hour was 1 km longer than the plan, and the result was 1 hour earlier. How many kilometers is the distance from the school to Wangcun?
毕业前夕，某校组织六年级的同学们从学校出发，徒步到距学校若干千米的王村参加社会实践活动．原计划5小时到达，实际每小时比计划多行1千米，结果提前1小时到达，学校到王村的距离有多少千米？
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">5 - 4</gadget>
<output>1</output>

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

<gadget id="calculator">4 * 1 * 5</gadget>
<output>20</output>

<result>20</result>