This looks confusing because of the differences in start times and velocities. But look at the similarities: they both travel the same distance and end at the same time. Mary traveled 75 minutes more than Joe, so if Joe covered the distance in x minutes, then Mary covered the same distance in x + 75 minutes (1.25 hours). So we can set up the equation as 65x = 40(x+1.25). Solve for x, then figure out when they met.
