7:45-5:51 gives you the difference in times remember 60sec per min (1:54)
turn it into only seconds so 60+54=114s and 7x60+45=645s
114/645 gives you the percentage of difference
Answer is: add 4 in between every time
Explanation:
in 45 and 49 there is difference of 4
and in the next 61 and 69 the difference is 8
every it adds 4
i hope you get the idea