Answer: 6 days
Explanation:
1. Multiply 54 1/4 by 2 (We are multiplying my 2 because 3 1/2 hours is half of 7 hours, so you have to multiply to see how much Suzy rode for 7 hours.
2. Now, divide 651 by the answer you get in step 1 to get your answer (simplify if necessary.)
=> 54 1/4 * 2 = 108 1/2
=> 651 / 108 1/2 = 6
I might be wrong but I hope this helps :)