and B start from the north and south cities at the same time and walk towards each other. A travels the whole distance (3/15) and meets B just in time. It is known that A travels 4.5 kilometers per hour, and B takes 6.5 hours to complete the journey, find the distance between the north and the south.
甲乙两人从南北城同时出发相向而行，甲行了全程的(3/15)，正好与乙相遇．已知甲每小时行4.5千米，乙走完全程需要6.5小时，求南北两地距离．
<gadget id="calculator">3 / 15</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">6.5 * (4/5)</gadget>
<output>5.2</output>

<gadget id="calculator">4.5 / (1/5)</gadget>
<output>22.5</output>

<gadget id="calculator">5.2 * 22.5</gadget>
<output>117</output>

<result>117</result>