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## Homework Statement

2 straight roads intersect at right angles. Car A, moving on one of the roads, approaches the intersection at 60km/h and car B moving on the other road, approaches the intersection at 80km/h. At what rate is the distance between the cars changing when A is 0.5km from the intersection and B is 0.7km from the intersection?

## The Attempt at a Solution

None. Dont know how. Dont give me the solution, give me a clue i want to try to solve it.