2/3 of an hour= 40 minutes 3/4 of 40= 30 minutes 40- 30= 10 So, it took Bethany 10 more minutes to complete her science homework than her math homework.
This is because 2/3 of an hour is 40 minutes and 3/4 of 40 is 30. 40-30=10. Therefore it took Bethany 10 more minutes to do her science homework than it did her math.
