math
posted by tiffany .
A scuba diver dove from the surface of the ocean to an elevation of 79 9/10 feet at a rate of 18.8 feet per minute. After spending 12.75 minutes at that elevation, the diver ascended to an elevation of 28 9/10 feet. The total time for the dive so far was 19 1/8 minutes. What was the rate of change in the diver's elevation during the ascent? why descent time is 4.25

math 
Steve
(28.9(79.9))/(19.12512.75(79.9/18.8)) = 24.0 ft/min
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