Two villages and towns, A and B, are 540 kilometers apart. A bus and a car leave opposite each other at the same time, and meet each other after 4 hours. It is known that the speed ratio of the bus to the speed of the cheap car is 4:5, how many kilometers will the bus travel when they meet?
甲乙两个乡镇相距540千米，大客车与小汽车同时从两地相对开出，经过4小时相遇．已知大客车的速度与小气车的速度比4：5，相遇时大客车行驶多少千米？
<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">540 * (4/9)</gadget>
<output>240</output>

<result>240</result>