A road roller rolled 0.75 hectares more in the morning than in the afternoon. Work 4.5 hours in the morning and 4 hours in the afternoon. How many hectares of road does this road roller averagely per hour?
一台压路机上午比下午多压路0.75公顷．上午工作4.5小时，下午工作4小时．这台压路机平均每小时压路多少公顷？
<gadget id="calculator">4.5 - 4</gadget>
<output>0.5</output>

<gadget id="calculator">0.75 / 0.5</gadget>
<output>1.5</output>

<result>1.5</result>