Relative speed of A and B = 6 – 1 = 5 round per hour As they are walking around a circular field and also in the same direction, hence they will first meet each other when there is a difference of one round between two. So, they will first meet after
1
5
hr =
1
5
×60 min = 12 min Hence, required time = 7.30 a.m. + 12 min = 7.42 a.m.