Car X is travelling west at 20 kph and Car Y is travelling south at 30 kph. Both are headed for a 4-way stop intersection pf the two roads. At what rate are the cars approaching each other when Car X is 100 kilometers and Car Y is 120 kilometers from the intersection?

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A: Solution is given below:

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A: I am attaching image so that you understand each and every step.

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A: This question can be solved using integration by parts.

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