SOLUTION: Can you please show me how to solve this and then I think I can understand the rest of the lesson. I just need help understanding how to set these up to solve. Perry left school

Question 785521: Can you please show me how to solve this and then I think I can understand the rest of the lesson. I just need help understanding how to set these up to solve. Perry left school and drove north at an average speed of 30 km/h. Jenny left one hour later and drove in the same direction but with an average speed of 45 km/h. How long did Perry drive before Jenny caught up? Thanks so much!
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Perry left school and drove north at an average speed of 30 km/h. Jenny left one hour later and drove in the same direction but with an average speed of 45 km/h. How long did Perry drive before Jenny caught up?
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When Jenny left, Perry was 30 km away (30 km/hr * 1 hour)
Jenny gains on Perry at 15 km/hr (45 - 30) (Her speed is 15 km/hr wrt to Perry)
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30/15 = 2 hours to catch up.
Perry drove 3 hours
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