Two cars, one going due south at the rate of \(30\text{ km/hr}\) and the other going due east at the rate of \(45\text{ km/hr}\), are travelling toward the intersection of two roads.

In \(\text{kph}\), at what rate are the cars approaching each other at the instant when the first car is \(0.2\text{ km}\) and the second car is \(0.15\text{ km}\) from the intersection?

Submit your answer as a positive number.

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