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Vehicle A is headed due west from a fixed point PP at a rate of 4545...

Vehicle A is headed due west from a fixed point PP at a rate of 4545 miles/hour. Vehicle B is headed due north from PP at an unknown rate, but it is known that the distance between the vehicles is increasing at a rate of 5050 miles/hour. How fast is vehicle B travelling when vehicle A is 150150 miles from PP and vehicle 2 is 8080 miles from PP ?

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