Ozebra and Koizumi set off from the Forest City and the Water City at the same time respectively, and head towards each other. When they met, Koizumi traveled 18 kilometers less than Joao's zebra, Joao's speed was 8 kilometers per hour, and Koizumi's speed was 5 kilometers per hour. So how many kilometers is the distance between the forest city and the water city?
奥斑马和小泉分别从森林之城、水上之城同时出发，相向而行．相遇时，小泉比奥斑马少行了18千米，若奥斑马的速度是8千米/小时，小泉的速度是5千米/小时．那么森林之城和水上之城相距多少千米？
<gadget id="calculator">8 + 5</gadget>
<output>13</output>

<gadget id="calculator">8 - 5</gadget>
<output>3</output>

<gadget id="calculator">18 / 3</gadget>
<output>6</output>

<gadget id="calculator">13 * 6</gadget>
<output>78</output>

<result>78</result>