Answer:
5:30 p.m.
Step-by-step explanation:
The red line stops every 5 min.
The green line stops every 6 min.
We need the lowest common multiple of these numbers: 30 min.
In that time, the red line bus will have made six trips and the green line bus will have made five.
If it's 5:00 p.m. right now, the two buses will leave at the same time
at 5:30 p.m.