A manuscript with 210 pages is printed by two printers at the same time. The first printer prints 5 pages per minute, and the second printer prints 9 pages per minute. How many minutes can the manuscript be printed?
一份稿件210页，由两台打印机同时打印，第一台每分钟打5页，第二台每分钟打9页，几分钟可打印完这份稿件？
<gadget id="calculator">9 + 5</gadget>
<output>14</output>

<gadget id="calculator">210 / 14</gadget>
<output>15</output>

<result>15</result>