Mariam came home with a lot of homework. She started her English reading at 3:45PM and ended at 4:30PM. She then worked on her history report from 4:30PM until 5:15PM. After dinner, she finished up with her math worksheets that took her from 5:40PM until 6:25PM. How long in total did it take Mariam to do all of her homework?

Read each question several times and then break it down.  Make certain you understand when you are adding, subtracting, multiplying, dividing or doing a combination of calculations.