Question 1031041
What is Jeremiah's average speed during the interval he is traveling the fastest?
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Where is the steepest line?  That's what you're looking for.  It would appear that this is the last interval, from hour 4 to hour 7.  During that time, he traveled 190 miles.  190 miles divided by 3 hours = 63.33 miles per hour.  The second interval looks similar.  Let's calculate that.  From hour 0.5 to hour 3, he traveled 140 miles (330 to 190).  140 miles divided by 2.5 hours = 56 miles per hour.
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(The process is correct; the small lines are difficult for me to see, so doublecheck the actual numbers on your end.)