the distance between the homes of A and B = 86 mile
speed of person A = 48 miles/hour
After one half-hour the distance traveled by A = 0.5 * 48 = 24 miles
the remaining distance = 86 - 24 = 62 miles
the speed of person B = 76 miles/hour
let they will meet at point x after t hours
So, the distance AX = 48 t
and the distance BX = 76 t
AX + BX = 62 miles
so,
48 t + 76 t = 62
124 t = 62
t = 62/124 = 0.5 hours
so, they meet after 0.5 hours