The driver of a parked car A observes that car B on a parallel lane is moving away from him at 90 km/h in the positive x direction while car C in another lane is approaching him with a speed of 30 km/h in the negative x direction. Relative to the driver on A, what is the speed of car B?
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The driver of a parked car A observes that car B on a parallel lane is moving away from him at 90 km/h in the positive x direction while car C in another lane is approaching him with a speed of 30 km/h in the negative x direction. Relative to the driver on A, what is the speed of car B?
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