Average rate= change in alt / change in time
r=-378/7=-54ft/min
Answer:
The answer of -1.
Step-by-step explanation:
You have to add both numbers together :

M=-3.5+2t, R=-3t when they meet M=R so
-3.5+2t=-3t
-3.5+5t=0
5t=3.5
t=0.7 hrs (42 minutes)
14.9 is rounded to 15 or if you are going by tens then it is 20