There is a bus line with a station every 2 kilometers. A car has 5 passengers boarding at the starting station; 3 passengers get off at each station along the way, 8 passengers get on the bus, and 45 passengers get off at the terminal station. How many kilometers has the car traveled from the start point to the end point?
有一条公交线路每隔2千米就有1个车站．一辆汽车在起点站有5个乘客上车；途中各站都有3个乘客下车，8个乘客上车，到终点站有45个乘客下车．这辆汽车从起点到终点共行驶多少千米．
<gadget id="calculator">45 - 5</gadget>
<output>40</output>

<gadget id="calculator">8 - 3</gadget>
<output>5</output>

<gadget id="calculator">40 / 5</gadget>
<output>8</output>

<gadget id="calculator">8 + 1</gadget>
<output>9</output>

<gadget id="calculator">9 * 2</gadget>
<output>18</output>

<result>18</result>