Solution: Joe is developing a portable speedometer for power boats. The device, shown in the figure at right, consists of a 1-inch diameter ell-shaped transparent plastic tube with graduations on the vertical leg of the ell. Joe places the tube in the water pointed in the direction of the boat's motion, with the bottom leg of the ell 1.00 foot below the surface. Water rises in the vertical leg to a level of 3 feet above the surface. How fast is the boat moving?

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Joe is developing a portable speedometer for power boats. The device, shown in the figure at right, consists of a 1-inch diameter ell-shaped transparent plastic tube with graduations on the vertical leg of the ell. Joe places the tube in the water pointed in the direction of the boat's motion, with the bottom leg of the ell 1.00 foot below the surface. Water rises in the vertical leg to a level of 3 feet above the surface. How fast is the boat moving?