the surface after 40 seconds. What is the scuba divers rate of change? 8. A rocket is 1 mile above the earth in 30 seconds and 5 miles above the earth in 2.5 minutes. What is the rockets rate of change in miles per second? What about miles per minute. 9. A teacher weighed 145 lbs in 1986 and weighs 190 lbs in 2007. What was the rate of change ...