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Mathematics 18 Online
OpenStudy (anonymous):

Two straight roads intersect at right angles, one running north-south and the other east-west. Jonathan jogs north through the intersection at a steady rate of 9km/h. Lia pedals her bicycle west at a steady rate of 18km/h and goes through the intersection 30 minutes AFTER Jonathan. How close do Jonathan and Lia come to each other? Please answer this question as I have a calculus test tomorrow and I'm lost. If you could show me the workings of how you did it it would be greatly appreciated!

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