Kelly can read five pages of her fiction book or two pages of her history textbook in seven minutes. If Kelly wants to read thirty pages of each book, for how many minutes in total must Kelly read?

147 mins

So five pages of her fiction book in 7 minutes. And she must read thirty pages:

30/5 = 6.

6 * 7 = 42 minutes for the fiction book.

So 2 pages of her history book in seven minutes.

30/2 = 15.

15 * 7 = 105 minutes for the history textbook

Add:

42 + 105 = 147 minutes.