Tourists row boats from the pier at 10:15 and are required to return no later than 13:00 on the same day. It is known that the river flow rate is 1.4 km/h, and the water flows to the pier. The speed of the boat in still water is 3 km/h. Hours, if he rests for 15 minutes every 30 minutes, does not change direction in the middle, and can only row back after a certain rest, then how many kilometers can he row away from the pier at most.
游客在10时15分由码头划船出游，要求在当天不迟于13时返回，已知河水流速为1.4千米/小时，且水流是流向码头的，船在静水中的速度为3千米/小时，如果他每划30分钟就休息15分钟，中途不改变方向，且只能在某次休息后往回划，那么他最多能划离码头多少千米．
<gadget id="calculator">2.4 - 0.7</gadget>
<output>1.7</output>

<result>1.7</result>