300
Lisa rolled over in bed as she felt the sunlight hit her face. The beams were warming the back of her neck when she slowly realized that it was a Thursday, and she felt a little too good for Thursday. Struggling to open her eyes, she look at the clock. "9:48!", she shouted, "Oh no!" Lisa jumped out of bed, threw on her uniform, brushed her teeth in 5 seconds, threw her books into her backpack, and ran out the door.
What problem is Cassie having, and how do you know this?
I can infer that Cassie is late for school because she saw the time on the clocks, hurried to get ready, and threw her books into her school bag.