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Two carts, A and B, are connected by a rope 39 ft long that passes over...

Two carts, A and B, are connected by a rope 39 ft long that passes over a pulley P. The point Q is on the floor h = 12 ft directly beneath P and between the carts. Cart A is being pulled away from Q at a speed of 4 ft/s. How fast is cart B moving toward Q at the instant when cart A is 5 ft from Q? (Round your answer to two decimal places.)

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