Dongdong went online twice yesterday, 9:20-9:50 in the morning and 4:00-4:55 in the afternoon. How much time did Dongdong spend on the Internet yesterday?
东东昨天上网两次，上午9：20-9：50，下午4：00-4：55．东东昨天一共上网的时间是多少．
<gadget id="calculator">30 + 55</gadget>
<output>85</output>

<result>85</result>