A knapsack sprayer, the volume of the liquid medicine tank is 15 liters, if it sprays out 750 milliliters of liquid medicine per minute, how many minutes does it take to spray a box of liquid medicine?
一种背负式喷雾器，药液箱的容积是15升，如果每分钟喷出药液750毫升，那么喷完一箱药液需要多少分钟？
<gadget id="calculator">15 * 1_000</gadget>
<output>15_000</output>

<gadget id="calculator">15_000 / 750</gadget>
<output>20</output>

<result>20</result>