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A scuba diver dove from the surface of the ocean to an elevation of −49 9/10
feet at a rate of −15.4 feet per minute. After spending 13.75 minutes at that elevation, the diver ascended to an elevation of −8 9/10
feet. The total time for the dive so far was 20 1/8
minutes. What was the rate of change in the diver's elevation during the ascent? Round your answer to the nearest hundredth.
The rate of change of the diver's elevation was _____ft/min.