The school organized the fourth-grade students to go to the eastern suburbs to play, and packed two large vans to start from the school. The speed of the first car is 30 kilometers per hour, and it starts at 7:00 in the morning. The second car drives 1 hour later, and the speed is 40 kilometers per hour. As a result, the two cars arrive at the same time. Q: How far is the Eastern Suburb Scenic Area from the school?
学校组织四年级同学去东郊游玩，包了两辆大面包车从学校出发．第一辆车速度是每小时30千米，上午7：00发车，第二辆车晚开1小时，速度是每小时40千米，结果两辆车同时到达．问：东郊风景区离学校多远？
<gadget id="calculator">1 / 30</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">1 / 40</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">(1/30) - (1/40)</gadget>
<output>1/120 = around 0.008333</output>

<gadget id="calculator">1 / (1/120)</gadget>
<output>120</output>

<result>120</result>