8:45 A.M. - 3:45 P.M. = 7 hours
7 hours * 5 days (Monday to Friday) = 35 hours (Number of hours spending in school)
60 hours (Number of hours spending in school and in work) - 35 hours = 25 hours (Number of hours spending in work)
T = 60 - 7 * 5
T = 25 hours
Pilar spends 25 hours in work each week