Is there a graph for this problem?
Answer: 7 pm
Step-by-step explanation: Rotating the hour hand 90 degrees will be 3 hours. So 4 plus 3 = 7
2.8-(-5.1)
-(-5.1)=5.1
2.8+5.1= 7.9
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It will take approx.65 of caffeine remaining after 6 hours
