Xiaohu goes boating in the park on weekends, departs from the boat rental office at nine o'clock, and plans to return to the boat rental office no later than eleven o'clock. It is known that the chartered boat is in the middle reaches of the river, the river is straight, and the river flow rate is 1.5 kilometers per hour. Every half an hour of rowing, Xiaohu has to rest for ten minutes to let the boat drift along the water. The speed of the boat in still water is 3 kilometers per hour; Q: How far can Xiaohu’s boat be from the charter place?
小虎周末到公园划船，九点从租船处出发，计划不超过十一点回到租船处．已知，租船处在河的中游，河道笔直，河水流速1.5千米/小时，每划船半小时，小虎就要休息十分钟让船顺水漂流．船在静水中的速度是3千米/小时；问：小虎的船最远可以离租船处多少千米？
<gadget id="calculator">15 / 40</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 + (3/8)</gadget>
<output>11/8 = around 1.375</output>

<result>11/8 = around 1.375</result>