Answer: he read 60 minutes on Wednesday.
Explanation:
Let x represent the number of minutes that Sean read on Monday.
He reads 3 times as many minutes on Tuesday as he does on Monday. This means that the number of minutes that he read on Tuesday is 3x
He reads 4 times as many minutes on Wednesday as he does on Monday. This means that the number of minutes that he read on Wednesday is 4x
Sean reads 45 minutes on Tuesday.
This means that
3x = 45
x = 45/3 = 15
Therefore, the number of minutes thaf Sean read on Wednesday is
4 × 15 = 60