person starts rowing at 9:15 and is expected to return to the original place before 12:00. It is known that the still water is 3 kilometers per hour and the water speed is 1.4 kilometers per hour. Each row is 30 minutes and the rest is 15 minutes. It must be after a certain rest Come back and ask how many kilometers away the boat can be from the starting point?
某人划船9：15出发，预计12：00之前回到原处，已知静水3千米/小时，水速1.4千米/小时，每行30分钟休息15分钟，必须是在某次休息以后回来，问船最远可以离起点多少千米？
<gadget id="calculator">3 - 1.4</gadget>
<output>1.6</output>

<gadget id="calculator">1.6 * 1.5</gadget>
<output>2.4</output>

<gadget id="calculator">1.4 * 0.5</gadget>
<output>0.7</output>

<gadget id="calculator">2.4 - 0.7</gadget>
<output>1.7</output>

<result>1.7</result>