The patrol boat patrols upstream from the lower reaches of the river and is required to return to the starting point within 3 hours. It is known that the speed of the boat in still water is 12 km/h, and the water speed is 2 km/h. Then How many kilometers can this patrol boat drive as far as possible?
巡逻艇从河流的下游向上游行驶进行巡逻，并要求在3个小时之内回到出发地点，已知船在静水中的速度为12千米/小时，水速为2千米/时，那么这艘巡逻艇最远能开出多少千米．
<gadget id="calculator">12 + 2</gadget>
<output>14</output>

<gadget id="calculator">5 + 7</gadget>
<output>12</output>

<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">14 * 3 * (5/12)</gadget>
<output>35/2 = around 17.5</output>

<result>35/2 = around 17.5</result>