Erin wants to figure out how much time elapsed between 9:45am and 11:30am. Erin does the following:

0 121

11:30

- 9:45

_______________

1:85

and says the answer is 1 hour and 85 minutes?

Please answer the following

A Is Erin right? If not, explain what is wrong with her method, and show how to modify her method of regrouping to make it correct ( do not start from scratch

B Solve the problem of how much time elapsed between 9:45am and 11:30am, in another way than your modification of Erin's method. Explain your method.