Zhang Ming's home is 4 kilometers away from the school. He goes to school by bicycle every morning, travels at a speed of 20 km/h, and arrives at school just on time. One morning, because of the headwind, he set off 0.2 o'clock earlier and rode at a speed of 10 km/h. When he was 2.4 kilometers away from the school, he met Li Qiang. They encouraged each other and accelerated the cycling speed. The result was faster than usual Arrive at school 5 minutes and 24 seconds ahead of time. How many kilometers did he ride every hour after meeting Li Qiang?
张明的家离学校4千米．他每天早晨骑自行车上学，以20千米/时的速度行进，恰好准时到校．一天早晨，因为逆风，他提前0.2时出发，以10千米/时的速度骑行，行至离学校2.4千米处遇到李强，他俩互相鼓励，加快了骑车的速度，结果比平常提前5分24秒到校．他遇到李强后每时骑行多少千米？
<gadget id="calculator">4 / 20</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">4 - 2.4</gadget>
<output>1.6</output>

<gadget id="calculator">1.6 / 10</gadget>
<output>0.16</output>

<gadget id="calculator">(1/5) - 0.09 - 0.16</gadget>
<output>-0.05</output>

<gadget id="calculator">0.2 + (-0.05)</gadget>
<output>0.15</output>

<gadget id="calculator">2.4 / 0.15</gadget>
<output>16</output>

<result>16</result>