a teacher teaches two class and each class contains 35 students. if she grade final exam at a rate of 15 minutes per exam. how many minutes will it take to grade all final . how many hours is this?

Ahh -- now this makes sense!

70 * 15 = 1050 minutes

1050 / 60 = _____ hours

To find out how many minutes it will take to grade all the final exams, we need to multiply the number of exams by the time taken to grade each exam.

Number of exams = Number of classes * Number of students per class
Number of exams = 2 classes * 35 students per class
Number of exams = 70 exams

Time taken to grade each exam = 15 minutes

Total time to grade all final exams = Number of exams * Time taken to grade each exam
Total time = 70 exams * 15 minutes
Total time = 1050 minutes

To convert the total time in minutes to hours, we divide the total time by 60 (since there are 60 minutes in an hour).

Total time in hours = Total time in minutes / 60
Total time in hours = 1050 minutes / 60
Total time in hours ≈ 17.5 hours

Therefore, it will take approximately 1050 minutes or 17.5 hours to grade all the final exams.