The Juniors and Seniors reported their scores on a standardized math test. The teacher displayed their scores on dot plots. What is the overlap in the scores for the Juniors and the Seniors?

550
535 – 550
530 – 560
505 – 580

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?