Two writers A and B want to go to the prairie to experience life. They have to walk 20 kilometers to the depths of the prairie every day. It is known that each person can carry food and water for one person at most for 15 days. If some food is not allowed to be stored on the way, How many kilometers can one of them go deep into the grassland?
甲、乙两位作家要到大草原体验生活，他们要每天向草原深处走20千米，已知每人最多可以携带一个人15天的食物和水，如果不许将部分食物存放于途中，其中一个人最远可以深入草原多少千米？
<gadget id="calculator">15 / 3</gadget>
<output>5</output>

<gadget id="calculator">15 - 5</gadget>
<output>10</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 + 5</gadget>
<output>10</output>

<gadget id="calculator">10 * 20</gadget>
<output>200</output>

<result>200</result>