Party A and Party B are traveling from a and B at the speed of 3 km and 5 km per hour respectively. After meeting, they continue to move forward. If a arrives at B from the meeting point Party A and Party B are traveling from a and B at the speed of 3km and 5km per hour respectively. After meeting each other, they continue to move forward, If it takes 4 hours for a to reach B from the meeting point, how many kilometers is the distance between AB and B? Using equation

Party A and Party B are traveling from a and B at the speed of 3 km and 5 km per hour respectively. After meeting, they continue to move forward. If a arrives at B from the meeting point Party A and Party B are traveling from a and B at the speed of 3km and 5km per hour respectively. After meeting each other, they continue to move forward, If it takes 4 hours for a to reach B from the meeting point, how many kilometers is the distance between AB and B? Using equation

Let two people meet in X hours,
According to the meaning of the title:
5X/3=4,
X=2.4,
AB distance: 2.4 × (3 + 5) = 19.2km