A boat is approaching, and it takes 6 seconds to pass Xiaohua. After a while, it takes 9 seconds for the boat to catch up with Xiaohua and pass him. If Xiaohua's walking speed is 3.6 per hour km, then how long is the boat in meters?
一条船迎面开来，从小华身旁开过用了6秒，过了一会儿，该船从后面追上小华从他身旁开过用了9秒，若小华的步行速度是每小时3.6千米，那么这条船长多少米．
<gadget id="calculator">6 + 9</gadget>
<output>15</output>

<gadget id="calculator">9 - 6</gadget>
<output>3</output>

<gadget id="calculator">15 / 3</gadget>
<output>5</output>

<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<result>36</result>