A is in the north of the city, and B is in the south of the city. The distance between the two is 6.3km. A travels northward at a speed of 4.2km/h, and B travels southward at a speed of 4.8km/h. How many h, the distance between the two is 19.8km.
甲在城北，乙在城南，两人相距6.3km，甲以4.2km/h的速度向北行进，乙以4.8kmh的速度向南行进，则多少h，两人相距19.8km．
<gadget id="calculator">19.8 - 6.3</gadget>
<output>13.5</output>

<gadget id="calculator">4.2 + 4.8</gadget>
<output>9</output>

<gadget id="calculator">13.5 / 9</gadget>
<output>1.5</output>

<result>1.5</result>