Please help me understand how my professor solved this and plugged in the values

Problem 4: Using the graph of a sin waves below estimate the phase difference Ad between the waves. We will do this by looking at the place where the waves intersect the x- axis on the right hand side of the y-axis. (a) Start by estimating the difference in time. (b) Now using the following equations find the frequency of the waves v. = sin (5.00-(- 6, ) and ya= sin (5.00-1 -6) (note you only need one of these). (c) Now using the following relationships determine Ad. 7-3. 7- 1. actual 1 =0.16-560 #.175 - ACC At=6-1 -0.315 4 4 5.00 T 2 . T 2 - 27 Ap= 2-1 =1.575 rad