bus is sent from point A to point B every full hour (such as 6:00, 7:00) throughout the day; every half hour (such as 6:30, 7:30) is sent from point B throughout the day A car goes to point A, and every bus travels on the same road. It takes 5 hours to travel from point A to point B and from point B to point A. How long is the bus traveling from point A to point B? How many buses from point B will you meet on the way (not including the buses that meet at the station)?
全天里每个整点钟(例如6：00、7：00)由A地发出一辆巴士到B地；全天里每个半点钟(例如6：30、7：30)由B地发出一辆车子到A地，每辆巴士都行驶在同一条道路上，由A地行驶至B地及由B地行驶至A地各需时5小时，请问从A地行驶至B地的巴士在途中会与多少辆由B地发出的巴士相遇(不包括在车站内相遇的巴士)？
<gadget id="calculator">5 / 0.5</gadget>
<output>10</output>

<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<result>9</result>