The distance between A and B ports measured on the 1:4000000 map is 9 cm. A cargo ship sails from port A to port B at a speed of 24 kilometers per hour at 5 am. When will the cargo ship arrive at port B?
在1：4000000的地图上量的A、B两港的距离是9厘米．一艘货船于上午5时以每小时24千米的速度从A港开往B港，货船什么时候到达B港？
<gadget id="calculator">1 / 4_000_000</gadget>
<output>1/4_000_000 = around 0</output>

<gadget id="calculator">9 / (1/4_000_000) / 100_000 / 24</gadget>
<output>15</output>

<gadget id="calculator">5 + 15</gadget>
<output>20</output>

<result>20</result>