From 10:30 am to 1:30 pm, an oil press extracts a total of 135 kilograms of oil. How many kilograms of oil is extracted per hour on average?
一台榨油机上午10：30到下午1时30分共榨油135千克，平均每小时榨油多少千克？
<gadget id="calculator">12 - 10.5</gadget>
<output>1.5</output>

<gadget id="calculator">1.5 + 1.5</gadget>
<output>3</output>

<gadget id="calculator">135 / 3</gadget>
<output>45</output>

<result>45</result>