Question 1205786
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(1) Obviously we can't help you with choosing the right graph, since you haven't shown them in your post.<br>
(2) The statement of a math problem should NEVER use the phrase "three times longer than", because nearly everyone interprets that to mean three times as long as, which is not correct.  Three times longer than x is x, plus 3 times x, or x+3x = 4x -- i.e., three times longer than is four times as long as.<br>
(3) The two specific questions that are asked are answered trivially, since in both cases the time spent studying for algebra is LESS than the time spent studying for chemistry.<br>