Distance = 16km
Speed of Michael = 3km/hr
Speed of Brandon = 4km/hr
By 11:30, Micheal covers 3/2 = 1.5 km.
After 11:30, they both are walking towards each other.
Hence, the speed = 3 + 4 = 7 km/Hr
Distance remaining = 14.5Km
Time = Distance/ Speed = 14.5/7 = 2.07 hours
0.07 hours = 0.07 x 60 min = 4 min
So, time = 2 hours and 4 minutes.
Time = 11:30 Am + 2 hours and 4 minutes = 1:34 PM