A porter on a certain mountain carries things up the mountain and travels 3.6 kilometers per hour. In fact, he rests for 15 minutes every 40 minutes. The total distance from the foot of the mountain to the top of the mountain is 10.8 kilometers. How many hours does it take for the porter to complete the journey?
某名山的挑夫挑东西上山每小时可行3.6千米，实际每行40分钟就休息15分钟，山脚到山顶共10.8千米，挑夫行完全程要多少小时．
<gadget id="calculator">10.8 / 3.6</gadget>
<output>3</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) * 4</gadget>
<output>1</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<result>4</result>