On a 1:6000000 map, the distance from Nanjing to Beijing is 15 centimeters. Plane A departs from Nanjing and flies 400 kilometers per hour. Plane B flies oppositely from Beijing at the same time. The speed per hour is 50% faster than that of Plane A. How many hours later will the two planes meet?
在1：6000000的地图上量得南京到北京的距离是15厘米．甲飞机从南京出发，每小时飞行400千米，乙飞机同时从北京相对飞出，每小时飞行速度比甲飞机快50%，几小时后两架飞机相遇？
<gadget id="calculator">1 / 6_000_000</gadget>
<output>1/6_000_000 = around 0</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">400 * (3/2)</gadget>
<output>600</output>

<gadget id="calculator">400 + 600</gadget>
<output>1_000</output>

<gadget id="calculator">15 / (1/6_000_000) / 100_000 / 1_000</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>