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A climber climbs up the lower part of the wall at a rate of 1.2 ft/min. The upper part of the wall is more difficult, and she climbs at 0.8 ft/min. She reaches the top of the wall in 51.5 min. How long did it take her to climb the lower part of the wall? At what height on the wall did her rate change? A. She spent 20 min climbing the lower wall and at 28.4 ft her rate of climb changed. B. She spent 22 min climbing the lower wall and at 26.4 ft her rate of climb changed. C.She spent 18 min climbing the lower wall and at 29.4 ft her rate of climb changed. D.She spent 26 min climbing the lower wall and at 28.4 ft her rate of climb changed.
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