Let p = position (m) and t = time (sec)
Remember Mervin is starting at 0 because he is on the far left. His growth rate is 5.5 m/s to the right.
So the equation for Mervin's position is p = 5.5t + 0, but the 0 is not needed so p = 5.5t is sufficient.
Do the same for Leela. Remember that her growth is negative and her starting position is different
Since Mervin and Leela will meet in the same position, set Mervin's position = Leela's position. This is like solving a system of equations using the equal values method.