Ten seconds after a plane in an air-show dives, it is 200 feet from where it began. After 30 seconds, it is 600 feet from where it began. At what rate is the plane diving?
speed = t in seconds
10t = 200feet II / 10
30t = 600feet II / 30
t = 20 feet p seconds
thanks
time of course
time = t in seconds
+83 
